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Canon · Mirrorless mount

Canon RF — flange distance, protocol, and adapter compatibility

Canon's full-frame mirrorless mount. Same 54 mm throat as EF but 20 mm flange (vs EF's 44 mm) and a 12-pin contact array supporting faster lens-to-body bandwidth. Mechanical-only EF→RF adapters are 24 mm thick, preserving every EF and EF-S lens's autofocus, IS, and aperture control with no glass.

Mount specifications

Flange focal distance
20 mm
Throat diameter
54 mm
Electronic protocol
Canon RF
Supported formats
full-frame, APS-C
Manufacturer
Canon
Introduced
2018
Status
Active production

Canon RF on the flange-distance axis

Canon RF sits at 20 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 scaleHorizontal axis from 0 to 60 millimetres showing the flange focal distance of every mount in the dataset, with Canon RF (20 mm) highlighted. Mirrorless mounts cluster below 20 mm; SLR mounts cluster around 44 to 46 mm. The gap between the two clusters is the room that a mechanical adapter occupies — the physical reason mirrorless bodies can take SLR glass natively.0 mm10 mm20 mm30 mm40 mm50 mm60 mmNikon Z16 mmC-mount17.526 mmFujifilm X17.7 mmCanon EF-M18 mmSony E18 mmMicro Four Thirds19.25 mmCanon RF20 mmL-Mount20 mmCanon RF cine20 mmFujifilm GFX26.7 mmLeica M27.8 mmKonica AR40.5 mmCanon FD42 mmMinolta SR43.5 mmCanon EF44 mmCanon EF-S44 mmCanon EF cine44 mmPraktica B44.4 mmSony A44.5 mmExakta44.7 mmM4245.46 mmPentax K45.46 mmContax45.5 mmOlympus OM46 mmNikon F46.5 mmPL52 mmT-mount55 mm
Flange focal distance (mm)SLR / DSLRMirrorlessRangefinderMedium-format mirrorlessCinemaLegacy SLR

Adapting Canon RF lenses onto other bodies

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

Body mountResultAdapter examplesCaveats

Body mount

Canon RF (cine)
flange 20 mm
Native
AF fullIS fullAp. electronic
  • no adapter required — stills RF glass mounts natively on Canon RF-mount cinema bodies (C70, C400, R5 C)
  • Cinema RF bodies preserve every stills-RF feature: Dual Pixel CMOS AF II, in-lens IS, electronic aperture and Control Ring.
  • C70 and C400 use the standard RF mount; no special adapter is needed for RF-mount L-series stills lenses.

Body mount

Canon EF-M
flange 18 mm
Mechanical
MFIS lens-onlyAp. wheel1.5× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon RF lens and Canon EF-M body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Body mount

Nikon Z
flange 16 mm
Mechanical
MFIS lens-onlyAp. wheel
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon RF lens and Nikon Z body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Body mount

Sony E (incl. FE)
flange 18 mm
Mechanical
MFIS lens-onlyAp. wheel
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon RF lens and Sony E (incl. FE) body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Body mount

Fujifilm X
flange 17.7 mm
Mechanical
MFIS lens-onlyAp. wheel1.5× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon RF lens and Fujifilm X 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 RF lens and C-mount body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Body mount

Fujifilm GFX (G-mount)
flange 26.7 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • Speed Booster / focal-reducer family
  • Flange clearance is only -6.7 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 RF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Fujifilm GFX (G-mount) (medium-format), plus the full-frame equivalent angle of view after the body's crop stacks on top.

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
28.0 mm

35.5 mm × 0.79× (medium-format 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

Micro Four Thirds
flange 19.25 mm
Speed booster
MFIS lens-onlyAp. wheel2× crop
  • Speed Booster / focal-reducer family
  • Flange clearance is only 0.8 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 RF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Micro Four Thirds (MFT), plus the full-frame equivalent angle of view after the body's crop stacks on top.

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
71.0 mm

35.5 mm × 2× (MFT 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

L-Mount
flange 20 mm
Speed booster
MFIS lens-onlyAp. wheel
  • 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 RF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a L-Mount (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top.

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

Leica M
flange 27.8 mm
Speed booster
MFIS lens-onlyAp. wheel
  • Speed Booster / focal-reducer family
  • Flange clearance is only -7.8 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 RF lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Leica M (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top.

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 RF body

You own a Canon RF 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 mountResultAdapter examplesCaveats

Lens mount

Canon RF (cine)
flange 20 mm
Native
MFno ISAp. electronic
  • no adapter required — RF-cine glass mounts natively on every RF body
  • RF-cine lenses are mechanically and electronically stills RF with a cine-geared barrel — they mount native on R5, R6, R3, C70, C400, R5 C, etc.
  • Canon CN-R primes carry electronic aperture but no AF motor; iris is body-controlled, focus is fully manual via 0.8 MOD geared ring.

Lens mount

Canon EF
flange 44 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.

Lens mount

Canon EF-S
flange 44 mm
Mechanical
AF fullIS fullAp. electronicvignettes
  • Canon EF-EOS R
  • Body auto-crops to APS-C (1.6×); resolution drops accordingly on full-frame RF bodies.

Lens mount

Canon FD
flange 42 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon FD lens and Canon RF body.

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 RF body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Lens mount

Sony A / Minolta A
flange 44.5 mm
Mechanical
MFIS lens-onlyAp. wheel
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Sony A / Minolta A lens and Canon RF body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Lens mount

Fujifilm GFX (G-mount)
flange 26.7 mm
Mechanical
MFIS lens-onlyAp. wheel1.27× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Fujifilm GFX (G-mount) lens and Canon RF body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Lens mount

M42 (Pentax / Praktica screw mount)
flange 45.46 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between M42 (Pentax / Praktica screw mount) lens and Canon RF body.

Lens mount

Leica M
flange 27.8 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Leica M lens and Canon RF body.

Lens mount

Pentax K
flange 45.46 mm
Mechanical
MFIS lens-onlyAp. wheel
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Pentax K lens and Canon RF 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
  • Wooden Camera PL-RF
  • IBE Optics PL-to-RF Mount Module (interchangeable on C70 / C400)
  • Vocas PL-RF
  • Pure mechanical — PL has no electronic interface, so AF / IS / electronic iris are all n/a.
  • Cooke /i or ZEISS eXtended Data contacts (where present) are not currently surfaced through these RF adapters.

Lens mount

Canon EF (cine)
flange 44 mm
Mechanical
MFno ISAp. electronic
  • Canon EF-EOS R (plain) — works for any EF-cine prime or zoom
  • Canon EF-EOS R 0.71× Cinema Speed Booster (Super 35-to-full-frame relay, designed for Canon EF-cine on C70's S35 sensor — note: the C70 itself is S35, but full-frame R5/R5 C also accept this adapter on the EF-cine glass)
  • Mechanically identical to mounting any EF lens on an RF body — the 24 mm EF-EOS R adapter preserves electronic aperture and is fully transparent.
  • AF stays manual-only because the cine lens has no AF motor; iris control is body-driven via the EF pins.

Lens mount

Exakta
flange 44.7 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Exakta lens and Canon RF 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 RF body.

Lens mount

Praktica B
flange 44.4 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Praktica B lens and Canon RF body.

Lens mount

Konica AR
flange 40.5 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Konica AR lens and Canon RF body.

Lens mount

Minolta SR / MC / MD
flange 43.5 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Minolta SR / MC / MD lens and Canon RF body.

Lens mount

Olympus OM
flange 46 mm
Mechanical
MFno ISAp. ring
  • Fotodiox Pro OM-EOS R
  • K&F Concept OM-EOS R
  • Urth OM to Canon RF
  • 26 mm flange clearance — generous adapter thickness; OM lenses hit infinity comfortably on full-frame R5/R6/R3 and APS-C R7/R10/R50.
  • Manual focus + manual aperture only. Canon RF bodies offer focus peaking and magnified focus assist in the EVF — usable workflow for stills.

Lens mount

Contax/Yashica (C/Y)
flange 45.5 mm
Mechanical
MFno ISAp. ring
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Contax/Yashica (C/Y) lens and Canon RF body.

Lens mount

Canon EF-M
flange 18 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • 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

Nikon Z
flange 16 mm
Speed booster
MFIS lens-onlyAp. wheel
  • Speed Booster / focal-reducer family
  • Flange clearance is only -4.0 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 E (incl. FE)
flange 18 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

Fujifilm X
flange 17.7 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • Speed Booster / focal-reducer family
  • Flange clearance is only -2.3 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

Micro Four Thirds
flange 19.25 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • Speed Booster / focal-reducer family
  • Flange clearance is only -0.8 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

L-Mount
flange 20 mm
Speed booster
MFIS lens-onlyAp. wheel
  • 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

C-mount
flange 17.526 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • 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.

Adapter SKU teardown

Curated adapter SKUs that involve the Canon RF 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).
  • 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. v1.00
      • Initial release covering R5 / R6 / R6 Mark II + curated Canon EF lens list
    2. v1.10
      • 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.

  • K&F Concept M42-EOS R Pro

    released 2020

    M42 (Pentax / Praktica screw mount) lens → Canon RF body

    • no firmware updates
    • not weather sealed
    • no glass — pass-through
    • Pro-line M42 screw-mount onto Canon RF — Canon's 20 mm flange (vs Canon EF's 44 mm) leaves plenty of clearance for the adapter's body, and infinity calibrates cleanly on every R-line body (R5 / R6 / R6 II / R3 / R8 / R10 / R50 / R100).
    • Mechanical-only — no electronics, no AF. Aperture is controlled by the M42 lens's own ring or stop-down lever. RF body's focus magnification and peaking aids handle manual focus.
  • Novoflex EOSR/LEM

    released 2019

    Leica M lens → Canon RF body

    • no firmware updates
    • not weather sealed
    • no glass — pass-through
    • CNC-machined-in-Germany aluminum body, dual-screw bayonet retention, per-unit infinity-focus calibration with paper spec sheet. Leica M-mount glass (Leica, Voigtländer VM, Zeiss ZM, Konica M-Hexanon, 7Artisans) onto Canon RF bodies (R5 II / R5 / R6 II / R3 / R8 / R10).
    • Mechanical-only — no AF, no electronic communication. Manual focus only with the RF body's focus peaking and magnify aids. The 20 mm RF flange + 27.8 mm M-mount flange leaves the adapter as a short, rigid ring (~8 mm thick).
    • Lifetime warranty against manufacturing defects; the most expensive M → RF adapter on the market (~3-5× K&F / Urth equivalents).
  • 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. v1.0
      • Initial release — Canon EF / EF-S onto Canon RF (R / RP / R5 / R6) with AF / IS / electronic aperture
    2. v2.0
      • 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.

  • Fotodiox FD-RF

    released 2019

    Canon FD lens → Canon RF body

    • no firmware updates
    • not weather sealed
    • no glass — pass-through
    • Canon FD / FL breech-lock and New FD (FDn) bayonet lenses onto Canon RF bodies. Mechanical-only — Canon abandoned FD in 1987 and never made a first-party FD→RF adapter, so a third-party ring (Fotodiox / Urth / K&F) is the only path. No AF, no electronics.
    • Built-in aperture actuator: FD lenses sit wide open off-camera, so the adapter holds the stop-down lever and the lens's own aperture ring then controls the diaphragm. The 42 mm FD flange clears RF's 20 mm by 22 mm — glassless, infinity preserved.

References

Common questions

Can I use Canon EF lenses on an RF body?
Yes — the Canon EF-EOS R adapter is a pure mechanical spacer (24 mm thick, no glass) that bridges EF's 44 mm flange to RF's 20 mm flange while passing the 8-pin EF protocol through to RF's 12-pin connector. AF, IS, and electronic aperture work on every EF and EF-S lens since 1987 across every RF body (R5, R6, R3, R7, R8, R10).
Why does Canon RF use a 12-pin connector instead of EF's 8-pin?
The four extra pins carry higher-bandwidth lens-to-body communication, used for in-lens metadata pass-through, the new RF Control Ring, and Dual Pixel CMOS AF II's per-frame focus telemetry. EF lenses still autofocus on RF through the adapter because the adapter exposes only the 8 EF-protocol pins to the lens — the RF body falls back to the EF subset automatically.
Is there a Canon RF-to-Sony-E adapter?
No usable one — Canon RF's electronic protocol is proprietary and undocumented, so no third party has produced a smart RF-to-E adapter with AF. Mechanical-only RF-to-E adapters exist (Fotodiox, Urth) but they break AF, IS, and aperture control. The standard cross-system path for Canon glass onto Sony E remains EF lens → Sony E body via the Sigma MC-11 or Metabones, not RF.

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