Can I use Canon EF lenses on a Canon mirrorless camera?

Yes — the Canon EF-EOS R adapter mounts every EF and EF-S lens onto Canon RF bodies (R5, R6, R3, R7, R8, R10) with full autofocus, image stabilisation, and electronic aperture preserved. Three variants ship: plain, Control Ring, and Drop-In Filter (variable ND or polariser). On the older EOS M (EF-M) line, the Canon EF-EOS M adapter does the same job onto APS-C M bodies.

Why is Canon EF so popular for adapter use compared to Nikon F?

Two reasons. First, EF's 44 mm flange leaves room for AF-preserving adapters from third parties (Sigma MC-11, Metabones T Smart V, Viltrox EF-NEX IV) onto Sony E and L-Mount bodies. Second, EF is fully fly-by-wire — focus and aperture both travel over the same 8-pin electronic protocol, so an adapter just passes that signal through, with no need to mechanically drive a screw-drive AF coupler the way Nikon F adapters do.

Are all Canon EF lenses autofocus?

Yes — every Canon EF lens since the system launched in 1987 has had an in-lens AF motor (USM, STM, or Nano USM on newer lenses; micromotor on early consumer zooms). Canon never built a body-driven EF lens, which is part of why EF adapts onto mirrorless so cleanly. EF-S (APS-C-only) and EF-M (the separate mirrorless mount) share the same fully-electronic approach.

Canon · DSLR / SLR mount

Canon EF — flange distance, protocol, and adapter compatibility

Canon's all-electronic SLR mount, introduced with the EOS system in 1987. Fully fly-by-wire — every EF lens has an in-lens AF motor and an electronic aperture; the body never mechanically couples to the lens. Compatible with EF, EF-S (APS-C bodies only), and EF-M (mirrorless via separate flange). The dominant base for cross-brand adaptation onto mirrorless thanks to thin profile and pure-electronic interface.

Mount specifications

Flange focal distance: 44 mm
Throat diameter: 54 mm
Electronic protocol: Canon EF
Supported formats: full-frame, APS-H, APS-C
Manufacturer: Canon
Introduced: 1987
Status: Active production

Canon EF on the flange-distance axis

Canon EF sits at 44 mm — highlighted in orange below. The flange-distance gap between the mirrorless and SLR clusters is the room a mechanical adapter occupies; that gap is why almost every SLR lens adapts onto every mirrorless body, and why the reverse is mechanically impossible.

Flange focal distance (mm)SLR / DSLRMirrorlessRangefinderMedium-format mirrorlessCinemaLegacy SLR

Adapting Canon EF lenses onto other bodies

You own Canon EF glass and want to mount it on a body with a different lens mount. Rows are sorted by feasibility.

Body mount	Result	Adapter examples	Caveats
Body mount Canon EF (cine) flange 44 mm	Native AF fullIS fullAp. electronic	no adapter required — stills EF glass mounts natively on Canon EF-mount cinema bodies (C200, C300 Mk II, C500 Mk II in EF mode)	Cinema EF bodies expose every stills-EF feature: full AF (where the lens supports it), in-lens IS, and electronic aperture. Servo zoom control (4-pin Servo connector on Canon's cine zooms) is not supported by stills EF lenses — irrelevant for primes.
Body mount Canon RF flange 20 mm	Mechanical AF fullIS fullAp. electronic	Canon EF-EOS R (plain) Canon EF-EOS R with Control Ring Canon EF-EOS R Drop-In Filter (Variable ND / Circular Polarizer)	Every Canon EF lens since 1987 preserves full AF, IS, and electronic aperture. EF-S lenses auto-crop to APS-C; full-frame RF bodies switch to 1.6× crop mode.
Body mount Canon FD flange 42 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF lens and Canon FD body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Body mount Canon EF-M flange 18 mm	Mechanical AF fullIS fullAp. electronic1.5× crop	Canon EF-EOS M	1.6× crop applies on every M-system body.
Body mount Nikon Z flange 16 mm	Mechanical AF partialIS fullAp. electronic	Fringer EF-NZ II	EF is a fully electronic mount with no aperture ring — a glassless mechanical ring leaves the diaphragm stuck wide open and gives no AF. The path that works is the electronic Fringer EF-NZ II (FR-NZ2), which drives AF, electronic aperture, optical IS, and EXIF passthrough. Single-shot AF is close to native; continuous-AF and high-burst tracking run a notch behind native Z glass and can be firmware-dependent. No screw-drive EF lenses exist — all EF AF runs through the in-lens motor.
Body mount Sony E (incl. FE) flange 18 mm	Mechanical AF fullIS fullAp. electronic	Sigma MC-11 EF-E Metabones EF-E Mark V Viltrox EF-E5 / EF-NEX IV Fringer EF-NZ (when paired with similar smart-EF adapters)	AF speed and tracking depends on lens; Sigma's own EF lenses with MC-11 perform closest to native. Some third-party EF lenses (Tamron, older Sigma) have known AF quirks — check per-lens compatibility lists.
Body mount Fujifilm X flange 17.7 mm	Mechanical AF fullIS fullAp. electronic1.5× crop	Fringer EF-FX Pro II Fringer EF-FX2	Fringer covers most modern Canon EF lenses with phase-detect AF on X-Trans bodies. 1.5× crop applies (X-mount is APS-C).
Body mount Fujifilm GFX (G-mount) flange 26.7 mm	Mechanical AF partialIS lens-onlyAp. electronicvignettes	Fringer EF-GFX Pro Steelsring EF-GFX	Image circle of EF lenses may vignette on the 44×33 mm GFX sensor — many users crop to 35 mm capture mode. AF preserved on a curated list of EF lenses; check the adapter maker's compatibility chart.
Body mount Micro Four Thirds flange 19.25 mm	Mechanical AF partialIS fullAp. electronic2× crop	Viltrox EF-M2 II (0.71× focal reducer, electronic) Metabones EF-MFT Speed Booster / Smart Adapter	Smart EF-MFT adapters pass electronic aperture and in-lens IS, and drive autofocus — but Micro Four Thirds bodies focus adapted EF glass by contrast-detect only, so AF is usable yet slower than native (hence partial). 2× crop applies on a straight adapter; a 0.71× focal-reducer variant (Viltrox EF-M2, Metabones Speed Booster) pulls the field of view back toward the EF lens's native angle and adds roughly one stop of light.
Body mount L-Mount flange 20 mm	Mechanical AF fullIS fullAp. electronic	Sigma MC-21 EF-L	MC-21 has the best AF coverage with Sigma's own EF lenses; Canon-brand EF lens support varies by model. Tamron and some older third-party EF lenses are not officially supported.
Body mount Leica M flange 27.8 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF lens and Leica M body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Body mount Canon RF (cine) flange 20 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF lens and Canon RF (cine) body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Body mount C-mount flange 17.526 mm	Mechanical MFIS lens-onlyAp. wheel2.7× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF lens and C-mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Body mount Konica AR flange 40.5 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF lens and Konica AR body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Body mount Canon EF-S flange 44 mm	Speed booster MFIS lens-onlyAp. wheel1.5× crop	Speed Booster / focal-reducer family	Flange clearance is only 0.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Canon EF-S (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Nikon F flange 46.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -2.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Nikon F (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Sony A / Minolta A flange 44.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -0.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Sony A / Minolta A (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount M42 (Pentax / Praktica screw mount) flange 45.46 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a M42 (Pentax / Praktica screw mount) (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Pentax K flange 45.46 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Pentax K (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount PL (Positive Lock) flange 52 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -8.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a PL (Positive Lock) (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Exakta flange 44.7 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -0.7 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Exakta (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount T-mount (T2) flange 55 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -11.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a T-mount (T2) (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Praktica B flange 44.4 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -0.4 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Praktica B (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Minolta SR / MC / MD flange 43.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Minolta SR / MC / MD (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Olympus OM flange 46 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -2.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Olympus OM (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount Contax/Yashica (C/Y) flange 45.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.	Speed Booster equivalence calculator Plug in any Canon EF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Contax/Yashica (C/Y) (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.

Adapting other lenses onto a Canon EF body

You own a Canon EF body and want to mount glass from other systems. Mirrorless-lens-onto-DSLR-body combinations are omitted (rear element collides with the mirror box).

Lens mount	Result	Adapter examples	Caveats
Lens mount Canon EF (cine) flange 44 mm	Native MFno ISAp. electronic	no adapter required — EF-cine glass mounts natively on EF bodies	EF-cine lenses are mechanically and electronically the EF mount with a reinforced collar and cine-geared rings — they mount native on every EF body. Canon CN-E primes carry electronic aperture but no AF motor; iris is body-controlled, focus is fully manual by design.
Lens mount Nikon F flange 46.5 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Nikon F lens and Canon EF body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Lens mount PL (Positive Lock) flange 52 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between PL (Positive Lock) lens and Canon EF body.
Lens mount T-mount (T2) flange 55 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between T-mount (T2) lens and Canon EF body.
Lens mount Olympus OM flange 46 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon EF body.
Lens mount Canon EF-S flange 44 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only 0.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Canon FD flange 42 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -2.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Sony A / Minolta A flange 44.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount M42 (Pentax / Praktica screw mount) flange 45.46 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Pentax K flange 45.46 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Exakta flange 44.7 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.7 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Praktica B flange 44.4 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.4 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Konica AR flange 40.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -3.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Minolta SR / MC / MD flange 43.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -0.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Lens mount Contax/Yashica (C/Y) flange 45.5 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 1.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.

Adapter SKU teardown

Curated adapter SKUs that involve the Canon EF mount on either side, with the operational specifics — body-side electronic contact count, firmware-update path, weather sealing, and whether optical glass is in the path.

Canon EF-EOS R
released 2018
Canon EF lens → Canon RF body
- 12 body-side contacts
- no firmware updates
- weather sealed
- no glass — pass-through
- Canon-first-party adapter for EF / EF-S → RF / RF-S bodies. Preserves AF, IS, electronic aperture on every EF lens since 1987.
- Three variants: plain, Control Ring (extra rotation ring), Drop-In Filter (variable ND or circular polarizer slides in).
Sigma MC-11
released 2016
Canon EF lens → Sony E (incl. FE) body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Excellent native-like AF performance with Sigma's own EF Art and Sports lenses; Canon-brand EF lens support varies by model.
- Firmware-updatable via the Sigma USB Dock (lens-side) using Sigma Optimization Pro — major lens-compat additions arrived through v1.10–v1.40.
Firmware history
1. v1.102016-12
  - Sigma Global Vision Art / Sports / Contemporary EF lens compatibility entries added
2. v1.202017-05
  - Phase-detect AF tracking improvements on Sony PDAF bodies
  - Additional Sigma Global Vision EF lens entries
3. v1.302017-09
  - Canon-brand EF lens compatibility table added (curated list)
4. v1.402018-06
  - Tamron EF lens compatibility entries added
  - Further Canon-brand EF lens compatibility additions
Approximate milestones — verify against the Sigma firmware page for the authoritative changelog.
Sigma MC-21
released 2019
Canon EF lens → L-Mount body
- 12 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Sigma's bridge from Canon EF + Sigma SA into the L-Mount Alliance ecosystem (Leica SL / CL, Panasonic Lumix S, Sigma fp).
- Best with Sigma's own EF Art / Contemporary / Sports lenses; Canon-brand EF compat is curated and listed on Sigma's published chart.
- Firmware-updatable via the Sigma USB Dock + Sigma Optimization Pro on the lens-side mount.
Firmware history
1. v1.002019-04
  - Initial release alongside the Panasonic Lumix S1 / S1R launch
  - Sigma Global Vision EF + Sigma SA mount compatibility tables
2. v1.102019
  - Additional Sigma Art / Contemporary EF lens compatibility entries
3. v1.202020
  - Canon-brand EF lens compatibility table added (curated list)
  - Continuous-AF stability fixes on Lumix S1 / S1H
Approximate milestones — verify against the Sigma firmware page for the authoritative changelog.
Metabones EF-E Mark V
released 2017
Canon EF lens → Sony E (incl. FE) body
- 11 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Long-running EF-on-Sony adapter; Mark V adds improved phase-detect AF support on PDAF-capable Sony bodies.
- Firmware-updatable via the USB port on the side of the adapter — Metabones publishes a versioned per-lens compat chart with each release.
Firmware history
1. v0.552017
  - Initial Mark V release — phase-detect AF on Sony a6500 / a9 / a7R II
2. v0.692018
  - Continuous-AF tracking with Sony Eye-AF on a7 III / a9
  - Tamron G2 lens compatibility entries added
3. v0.792020
  - Tracking refinements for a7s III / a7R IV / a9 II
  - Additional Canon EF lens entries in the published chart
Approximate milestones — verify against the Metabones firmware page for the authoritative changelog.
Metabones Speed Booster ULTRA 0.71× EF-E
released 2014
Canon EF lens → Sony E (incl. FE) body
- 11 body-side contacts
- firmware updatable
- not weather sealed
- optical glass in path (focal reducer)
- Focal reducer for APS-C Sony E bodies (a6xxx series) — multiplies aperture by ~1 stop and reduces focal length by 0.71×, effectively letting EF full-frame lenses cover the APS-C sensor with extra light.
- Not for full-frame E-mount bodies (image circle won't cover the sensor).
- Same side USB port as the plain EF-E V — firmware track is shared lineage with the non-Booster Mark V.
Firmware history
1. v0.512017
  - Phase-detect AF support on Sony APS-C bodies with on-sensor PDAF (a6300 / a6500)
2. v0.692019
  - Tracking improvements on a6600 with Sigma EF Art / Contemporary lenses
Approximate milestones — verify against the Metabones firmware page for the authoritative changelog.
Viltrox EF-EOS R5 (autofocus EF-to-RF)
released 2024
Canon EF lens → Canon RF body
- 12 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Third-party alternative to Canon's official EF-EOS R; significantly cheaper, similar AF behaviour on most EF lenses.
- Firmware-updatable via USB-C, which is uncommon for the price point.
Firmware history
1. v1.002024
  - Initial release covering R5 / R6 / R6 Mark II + curated Canon EF lens list
2. v1.102024
  - Refined AF performance with EF 70-200 f/2.8L IS III / EF 100-400 f/4.5-5.6L IS II
  - EOS R3 / R5 specific tuning
Approximate milestones — verify against the Viltrox firmware page for the authoritative changelog.
Viltrox EF-NEX IV (EF-E)
released 2018
Canon EF lens → Sony E (incl. FE) body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Budget EF-on-Sony adapter with electronic communication and firmware-updatable AF support.
- AF performance lags Metabones / MC-11 with non-Sigma EF lenses but is workable for static subjects.
Firmware history
1. v1.002018
  - Initial release — phase-detect AF on Sony a7 III / a9
2. v2.002019
  - Broad AF tracking refinements
  - Additional Sigma + Tamron EF lens compatibility entries
3. v2.102021
  - Eye-AF subject tracking stability on a7 IV / a1
Approximate milestones — verify against the Viltrox firmware page for the authoritative changelog.
Fringer EF-FX Pro II
released 2020
Canon EF lens → Fujifilm X body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Most reliable EF-on-Fuji-X adapter for phase-detect AF; manufacturer publishes a maintained per-lens compatibility list.
- Firmware updates over USB have continued for years post-release.
Firmware history
1. v1.002020
  - Pro II initial release — AF on X-T3 / X-T4 / X-Pro3 with Sigma + Tamron + Canon EF Series
2. v1.302021
  - Tamron G2 28-75 / 70-180 compatibility entries
  - Face / Eye-AF stability on X-T4
3. v1.502022
  - X-H2S / X-H2 / X-T5 phase-detect tracking compatibility
  - Continuous-AF refinements with Sigma 150-600 Contemporary
4. v2.002023
  - Animal / Bird / Vehicle subject-detection AF on X-H2S
  - Additional Canon EF L II / III lens entries
Approximate milestones — verify against the Fringer firmware page for the authoritative changelog.
Fringer EF-GFX Pro
released 2019
Canon EF lens → Fujifilm GFX (G-mount) body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Brings EF lenses onto Fuji GFX medium-format bodies with AF on a curated list. Image circle of EF lenses may vignette on the 44×33 mm sensor — users often crop to 35 mm capture mode.
- Firmware-updatable via USB to track new EF lens releases.
Firmware history
1. v1.002019
  - Initial release — Sigma Art + Canon EF L on GFX 50S / 50R with phase-detect AF
2. v1.202020
  - GFX 100 / 100S subject tracking refinements
  - Additional Canon EF lens compatibility entries
3. v1.502023
  - GFX 100 II compatibility and Eye-AF stability improvements
  - Tamron G2 lens entries
Approximate milestones — verify against the Fringer firmware page for the authoritative changelog.
Canon EF-EOS M
released 2012
Canon EF lens → Canon EF-M body
- 11 body-side contacts
- no firmware updates
- not weather sealed
- no glass — pass-through
- Canon's adapter from EF / EF-S onto the EOS M (EF-M) APS-C mirrorless line. Discontinued in spirit as Canon shifted M-line to RF-S in 2023.
- Full AF, IS, and electronic aperture; 1.6× crop on every M body.
Fotodiox Pro EF-NEX
released 2018
Canon EF lens → Sony E (incl. FE) body
- 9 body-side contacts
- no firmware updates
- not weather sealed
- no glass — pass-through
- Budget electronic EF-on-Sony adapter; passes electronic aperture and EXIF, supports basic AF on most modern Canon EF and Sigma DG lenses.
- AF is contrast-detect biased on PDAF-capable Sony bodies — markedly slower than the Sigma MC-11 or Metabones EF-E V. Best for portrait, landscape, and other non-tracking work.
- No firmware-update port; what ships in the box is what you get. Adequate as a second adapter or for backup, not as a primary AF path.
Kipon Baveyes EF-FE 0.7x
released 2017
Canon EF lens → Sony E (incl. FE) body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- optical glass in path (focal reducer)
- 0.7× focal reducer (Brian Caldwell optics under Caldwell Photographic licence — same patented IP family as Metabones' Speed Booster ULTRA) for adapting EF full-frame lenses to Sony APS-C bodies (a6000-series, FX30). ~1 stop wider effective aperture and 0.7× focal-length factor on top of the APS-C crop.
- Electronic aperture and basic AF preserved on EF USM / STM lenses. AF is contrast-detect-biased on PDAF Sony bodies — slower than Sigma MC-11 / Metabones EF-E V on tracking, but typically $300-400 cheaper than the equivalent Metabones Speed Booster.
- Lands at 60-80% the price of Metabones Speed Booster ULTRA EF-E with comparable optical performance on Sigma Art / Canon L USM glass.
Firmware history
1. v1.02017
  - Initial release — Canon EF / EF-S onto Sony E APS-C bodies with 0.7× optical reduction and electronic aperture / AF pass-through
2. v2.02020
  - PDAF refinements on Sony a6400 / a6600
  - Additional Canon EF L USM lens compatibility entries
Approximate milestones — verify against the Kipon firmware page for the authoritative changelog.
Kipon Baveyes EF-FX 0.7x
released 2017
Canon EF lens → Fujifilm X body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- optical glass in path (focal reducer)
- 0.7× focal reducer (Caldwell-licensed optics) for Canon EF onto Fujifilm X APS-C bodies. 1 stop wider effective aperture and ~equivalent full-frame field-of-view on the X-mount sensor.
- AF on EF USM / STM lenses on X-T5 / X-H2 / X-H2S after v2.0 firmware; tracking is slower than Fringer EF-FX Pro II but optical reduction is the differentiator. USB-C firmware updates from kipon.com.
Firmware history
1. v1.02017
  - Initial release — Canon EF onto Fujifilm X APS-C with 0.7× reduction and basic AF / electronic aperture
2. v2.02022
  - X-T5 / X-H2 / X-H2S phase-detect refinements
  - Canon EF L II / III lens compatibility additions
Approximate milestones — verify against the Kipon firmware page for the authoritative changelog.
Commlite CM-EF-NEX HS
released 2018
Canon EF lens → Sony E (incl. FE) body
- 9 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Second-generation Commlite EF-on-Sony adapter with USB-C firmware port and on-sensor PDAF support — sits between Fotodiox (no firmware, contrast-detect biased) and Sigma MC-11 / Metabones EF-E V (broader certified per-lens charts) on the price-to-AF curve.
- AF is reliable for single-shot static work on Canon USM / STM EF lenses on Sony PDAF bodies; continuous tracking lags Sigma / Metabones on fast subjects.
- Updates ~twice a year via the USB-C port; cadence is slower than Sigma / Metabones / Megadap. Value pick when the budget excludes the leaders and Viltrox EF-NEX IV stock is unavailable.
Firmware history
1. v1.02018
  - Initial high-speed (HS) release — second-generation Commlite EF-NEX with USB-C firmware port
  - Phase-detect AF on Sony a7 III / a6500 / a9
2. v2.02021
  - a7 IV / a7R V / a1 PDAF rule alignment
  - Sigma Global Vision EF lens compatibility additions
Approximate milestones — verify against the Commlite firmware page for the authoritative changelog.
Commlite CM-EF-EOS R
released 2019
Canon EF lens → Canon RF body
- 12 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Third-party EF → Canon RF adapter at ~50% the price of Canon's first-party EF-EOS R. Preserves AF / IS / electronic aperture on every EF / EF-S Canon and Sigma DG / Tamron Di USM / STM lens; USB-C firmware updatable.
- Functionally similar to Viltrox EF-EOS R5; Viltrox tracks slightly better on EF L super-telephotos in side-by-side tests, Commlite costs slightly less. Both lack the weather sealing of Canon's official adapter.
Firmware history
1. v1.02019
  - Initial release — Canon EF / EF-S onto Canon RF (R / RP / R5 / R6) with AF / IS / electronic aperture
2. v2.02022
  - R5 II / R6 II / R7 / R10 / R8 PDAF rule alignment
  - EF-S APS-C crop-mode handling refinements
Approximate milestones — verify against the Commlite firmware page for the authoritative changelog.
Viltrox EF-M2 II
released 2018
Canon EF lens → Micro Four Thirds body
- 11 body-side contacts
- firmware updatable
- not weather sealed
- optical glass in path (focal reducer)
- 0.71× focal-reducer ('speed booster') for Canon EF / EF-S glass on Micro Four Thirds bodies — recovers roughly one stop of light and widens the field of view, pulling the effective crop from the bare 2.0× MFT factor toward ~1.42×.
- Autofocus supported for EF / EF-S lenses (single-shot AF reliable; continuous AF noticeably slower than native MFT glass). Forwards electronic aperture and EXIF; firmware-updatable via micro-USB.
- A Canon EF 50 mm f/1.8 behaves close to a 71 mm f/1.3-equivalent in full-frame field-of-view + depth-of-field terms on the 2× sensor; an EF 24 mm f/2.8 widens to roughly a 34 mm f/2.0-equivalent.
Firmware history
1. v1.002018
  - Initial release of the revised 'II' — improved AF firmware and coatings over the original EF-M2
  - 0.71× focal reduction with single-shot AF, electronic aperture, EXIF and in-lens IS pass-through for Canon EF / EF-S glass on Micro Four Thirds bodies, updatable over micro-USB
2. v2.002020
  - AF-tuning refinements and an expanded EF / EF-S + Sigma / Tamron EF lens-compatibility list
  - More reliable single-shot AF on Panasonic GH5 / G9 and Olympus OM-D E-M1 Mark II bodies
Approximate milestones — verify against the Viltrox firmware page for the authoritative changelog.
Fotodiox Vizelex ND Throttle EF-NEX
released 2014
Canon EF lens → Sony E (incl. FE) body
- no firmware updates
- not weather sealed
- no glass — pass-through
- Built-in variable ND filter (≈2–8 stops) dialled via a rotating ring on the adapter body — the defining feature, giving exposure control without front filters.
- Purely mechanical: no electronic contacts, no AF, no aperture coupling. Because EF lenses set aperture electronically, every EF lens stays at its maximum aperture on this adapter — the built-in ND is how you control exposure and bright-light depth instead of stopping the iris down.
- Not a focal reducer — the ND is flat glass, so field of view and infinity focus are unchanged (EF 44.0 mm → Sony E 18.0 mm leaves ample mechanical clearance).
Fringer EF-NZ II
released 2023
Canon EF lens → Nikon Z body
- 11 body-side contacts
- firmware updatable
- weather sealed
- no glass — pass-through
- The reputable Canon EF / EF-S → Nikon Z autofocus adapter — drives AF (AF-S / AF-C / AF-F, single-point through subject-detect), electronic aperture, optical IS and EXIF passthrough. Single-shot AF is close to native; continuous-AF and high-burst tracking run a notch behind native Z glass and can be firmware-dependent.
- No first-party EF → Z adapter exists — Nikon's FTZ / FTZ II are F-mount-to-Z only. A handful of lesser-known electronic EF → Z adapters exist with more variable reliability, but Fringer is the maintained, reputable choice.
- Best results on Sigma Global Vision EF (Art / Sports / Contemporary) and the Canon L USM zooms Fringer lists explicitly (24-70 f/2.8L II, 70-200 f/2.8L IS III, 100-400 L IS II). No screw-drive EF lenses exist — all EF AF runs through the in-lens motor, which the adapter drives electronically. The EF → Z ecosystem is younger and thinner than EF → Sony E, so check the current per-lens chart before buying.
Firmware history
1. v1.02023
  - EF-NZ II (FR-NZ2) launch — adds weather sealing and removes the tripod foot of the original EF-NZ (FR-NZ1) for vertical-grip clearance; AF, electronic aperture, IS and EXIF on Canon EF / EF-S and Sigma / Tamron EF-mount lenses across Z bodies
2. v2.302026
  - Current shipping firmware (2026-03) — periodic per-lens AF compatibility and newer Z-body support refinements; Fringer maintains an active compatibility chart
Approximate milestones — verify against the Fringer firmware page for the authoritative changelog.

References

Common questions

Can I use Canon EF lenses on a Canon mirrorless camera?: Yes — the Canon EF-EOS R adapter mounts every EF and EF-S lens onto Canon RF bodies (R5, R6, R3, R7, R8, R10) with full autofocus, image stabilisation, and electronic aperture preserved. Three variants ship: plain, Control Ring, and Drop-In Filter (variable ND or polariser). On the older EOS M (EF-M) line, the Canon EF-EOS M adapter does the same job onto APS-C M bodies.
Why is Canon EF so popular for adapter use compared to Nikon F?: Two reasons. First, EF's 44 mm flange leaves room for AF-preserving adapters from third parties (Sigma MC-11, Metabones T Smart V, Viltrox EF-NEX IV) onto Sony E and L-Mount bodies. Second, EF is fully fly-by-wire — focus and aperture both travel over the same 8-pin electronic protocol, so an adapter just passes that signal through, with no need to mechanically drive a screw-drive AF coupler the way Nikon F adapters do.
Are all Canon EF lenses autofocus?: Yes — every Canon EF lens since the system launched in 1987 has had an in-lens AF motor (USM, STM, or Nano USM on newer lenses; micromotor on early consumer zooms). Canon never built a body-driven EF lens, which is part of why EF adapts onto mirrorless so cleanly. EF-S (APS-C-only) and EF-M (the separate mirrorless mount) share the same fully-electronic approach.

Mount specifications

Canon EF on the flange-distance axis

Adapting Canon EF lenses onto other bodies

Adapting other lenses onto a Canon EF body

Adapter SKU teardown

Canon EF-EOS R

Sigma MC-11

Sigma MC-21

Metabones EF-E Mark V

Metabones Speed Booster ULTRA 0.71× EF-E

Viltrox EF-EOS R5 (autofocus EF-to-RF)

Viltrox EF-NEX IV (EF-E)

Fringer EF-FX Pro II

Fringer EF-GFX Pro

Canon EF-EOS M

Fotodiox Pro EF-NEX

Kipon Baveyes EF-FE 0.7x

Kipon Baveyes EF-FX 0.7x

Commlite CM-EF-NEX HS

Commlite CM-EF-EOS R

Viltrox EF-M2 II

Fotodiox Vizelex ND Throttle EF-NEX

Fringer EF-NZ II

References

Common questions

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