Are Olympus OM lenses related to Olympus Micro Four Thirds lenses?

No — different systems. OM is the 1972 manual-focus 35 mm SLR mount, in production through 2003. Micro Four Thirds (2008) is a separate APS-format mirrorless mount co-developed by Olympus and Panasonic. There is no electrical or mechanical compatibility — Olympus offered an OM-to-MFT adapter (the MF-2) for mounting legacy OM glass onto MFT bodies, but no AF or aperture coupling is preserved; focus is manual and aperture is set on the lens.

Will Olympus OM Zuiko lenses adapt to a Sony E or Canon RF body?

Yes — pure mechanical OM-to-E, OM-to-RF, OM-to-Z, OM-to-X, and OM-to-MFT adapters are widely available ($15-40 from K&F Concept, Urth, Fotodiox). The 46.0 mm flange — the deepest of any common legacy-SLR mount — gives the most adapter thickness room of any vintage system, which helps mechanical rigidity. Focus is manual; aperture is set on the lens's external ring.

Which Zuiko OM lenses are sought-after for mirrorless adaptation?

Zuiko 50 mm f/1.8 (sharp affordable standard, $30-70), Zuiko 50 mm f/1.4 ($100-200), Zuiko 24 mm f/2.8 ($80-150), Zuiko 100 mm f/2.8 (compact short tele, $100-200), Zuiko 90 mm f/2 macro (1:2 native, $500-900), Zuiko 50 mm f/3.5 macro (1:2 native, $80-150). Olympus's compact-SLR design philosophy extended to the lenses, so the Zuiko line is famously small and light — well-suited to modern mirrorless body sizes.

Olympus · Legacy SLR mount

Olympus OM — flange distance, protocol, and adapter compatibility

Olympus's compact-SLR bayonet, introduced on the OM-1 in 1972 and produced through the OM-2000 in 2003 — the mount that defined how light and small a 35 mm SLR could be. Pure mechanical: shutter-speed dial sits around the lens throat (not on the top plate) and aperture is read mechanically via the body-driven OTF metering linkage; no electrical contacts in any iteration. Native Zuiko glass is famously compact and optically distinctive — the 50 mm f/1.8, 24 mm f/2.8, 100 mm f/2.8, and the macro line (50 mm f/3.5, 90 mm f/2 macro) are still sought-after for mirrorless adaptation. The 46.0 mm flange means OM lenses adapt cleanly onto every mirrorless mount (Sony E, Canon RF, Nikon Z, Fujifilm X, MFT, L-Mount) with a plain mechanical spacer — the largest flange-to-mirrorless gap of any common legacy-SLR mount, which leaves generous adapter thickness for high-precision builds.

Mount specifications

Flange focal distance: 46 mm
Throat diameter: 47.4 mm
Electronic protocol: Mechanical only (no electronic coupling)
Supported formats: full-frame, APS-C
Manufacturer: Olympus
Introduced: 1972 (discontinued)
Status: Discontinued

Olympus OM on the flange-distance axis

Olympus OM sits at 46 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 Olympus OM lenses onto other bodies

You own Olympus OM 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 flange 44 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.
Body mount Canon EF-S flange 44 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon EF-S body.
Body mount Canon RF flange 20 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.
Body mount Canon FD flange 42 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon FD body.
Body mount Canon EF-M flange 18 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon EF-M body.
Body mount Nikon Z flange 16 mm	Mechanical MFno ISAp. ring	K&F Concept OM-NIK Z Fotodiox OM-Nikon Z Urth OM to Nikon Z	30 mm flange clearance — the deepest mirrorless adapter target for OM lenses, leaving plenty of room for a rigid all-metal build. Manual focus + manual aperture only. Z9/Z8 in-body image stabilisation can compensate for handheld shake even with the lens IS-less; Z bodies offer focus peaking and 8× / 16× magnified focus assist.
Body mount Sony E (incl. FE) flange 18 mm	Mechanical MFno ISAp. ring	K&F Concept OM-NEX Fotodiox Pro OM-NEX Voigtländer VM-E (for M-mount-converted Zuiko) Metabones OM-NEX (premium)	28 mm flange clearance — comfortable thickness for a high-rigidity build, no infinity-focus risk on full-frame or APS-C E bodies. Manual focus + manual aperture only — no electronic communication. The 35 mm-format Zuiko line covers full-frame E (FE) bodies without vignetting.
Body mount Fujifilm X flange 17.7 mm	Mechanical MFno ISAp. ring1.5× crop	K&F Concept OM-FX Fotodiox Pro OM-FX Urth OM to Fujifilm X	28.3 mm flange clearance — comfortable adapter thickness. Manual focus + manual aperture only. 1.5× APS-C crop turns a 50 mm Zuiko into a 75 mm-equivalent FOV, useful for portrait reach from compact glass.
Body mount Fujifilm GFX (G-mount) flange 26.7 mm	Mechanical MFno ISAp. ringvignettes	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Fujifilm GFX (G-mount) body.
Body mount Micro Four Thirds flange 19.25 mm	Mechanical MFno ISAp. ring2× crop	Olympus MMF-3 (weather-sealed first-party) Fotodiox Pro OM-MFT K&F Concept OM-M43 Urth OM to Micro Four Thirds Adapter	26.75 mm flange clearance — generous adapter thickness; every Zuiko OM lens hits infinity without optical correction. Every Zuiko OM lens is manual-focus with a mechanical aperture ring. Stop-down metering and focus-confirm work on the body's EVF; autofocus, electronic aperture, and IS pass-through are not available (no electrical contacts).
Body mount L-Mount flange 20 mm	Mechanical MFno ISAp. ring	K&F Concept OM-LM Novoflex L-OM Fotodiox OM to L-Mount	26 mm flange clearance — generous adapter thickness on Panasonic S5/S1, Leica SL, and Sigma fp. Manual focus + manual aperture only. Panasonic L-mount bodies offer focus peaking + IBIS-assisted handheld stabilisation for vintage glass.
Body mount Leica M flange 27.8 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Leica M body.
Body mount Canon EF (cine) flange 44 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon EF (cine) body.
Body mount Canon RF (cine) flange 20 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Canon RF (cine) body.
Body mount C-mount flange 17.526 mm	Mechanical MFno ISAp. ring2.7× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and C-mount body.
Body mount Konica AR flange 40.5 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Olympus OM lens and Konica AR body.
Body 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 Olympus OM lens and Minolta SR / MC / MD body.
Body mount Nikon F flange 46.5 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 Olympus OM 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 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 Olympus OM 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 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 Olympus OM 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 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 Olympus OM 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 -6.0 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 Olympus OM 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 1.3 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.	Speed Booster equivalence calculator Plug in any Olympus OM 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 -9.0 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 Olympus OM 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 1.6 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 Olympus OM 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 Contax/Yashica (C/Y) flange 45.5 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 Olympus OM 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 Olympus OM body

You own a Olympus OM 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 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 Olympus OM 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 Olympus OM body.
Lens mount Canon EF flange 44 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 Canon EF-S flange 44 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 Canon FD flange 42 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 Nikon F flange 46.5 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 Sony A / Minolta A flange 44.5 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.
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 -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 Pentax K flange 45.46 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 Canon EF (cine) flange 44 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 Exakta flange 44.7 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -1.3 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 Praktica B flange 44.4 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -1.6 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 -5.5 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 -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.
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 -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.

Adapter SKU teardown

Curated adapter SKUs that involve the Olympus OM 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.

Novoflex SONY/OM
released 2016
Olympus OM lens → Sony E (incl. FE) body
- no firmware updates
- not weather sealed
- no glass — pass-through
- Olympus OM (OM Zuiko 1972-2003 line — 21, 24, 28, 35, 50, 85, 90 Macro, 100, 135, 200 mm primes) onto Sony E with CNC-German precision. The 46 mm OM flange clearance over Sony E's 18 mm makes the Novoflex SONY/OM a substantial barrel.
- Mechanical-only; OM lens aperture controlled by the lens's own ring. Infinity-focus calibrated per-unit. Lifetime warranty.
Urth Olympus OM-E
released 2020
Olympus OM lens → Sony E (incl. FE) body
- no firmware updates
- not weather sealed
- no glass — pass-through
- Olympus OM (Zuiko) bayonet onto Sony E. Mechanical-only ring — no AF, no electronics. The OM aperture ring drives the diaphragm directly. Recycled-aluminum build with a matte-black interior that helps suppress flare from bright vintage elements.
- The 46 mm OM flange clears Sony E's 18 mm by 28 mm — glassless, infinity preserved. The famously compact OM Zuiko primes (24/2, 35/2, 50/1.4, 100/2) pair naturally with small α bodies.

References

Common questions

Are Olympus OM lenses related to Olympus Micro Four Thirds lenses?: No — different systems. OM is the 1972 manual-focus 35 mm SLR mount, in production through 2003. Micro Four Thirds (2008) is a separate APS-format mirrorless mount co-developed by Olympus and Panasonic. There is no electrical or mechanical compatibility — Olympus offered an OM-to-MFT adapter (the MF-2) for mounting legacy OM glass onto MFT bodies, but no AF or aperture coupling is preserved; focus is manual and aperture is set on the lens.
Will Olympus OM Zuiko lenses adapt to a Sony E or Canon RF body?: Yes — pure mechanical OM-to-E, OM-to-RF, OM-to-Z, OM-to-X, and OM-to-MFT adapters are widely available ($15-40 from K&F Concept, Urth, Fotodiox). The 46.0 mm flange — the deepest of any common legacy-SLR mount — gives the most adapter thickness room of any vintage system, which helps mechanical rigidity. Focus is manual; aperture is set on the lens's external ring.
Which Zuiko OM lenses are sought-after for mirrorless adaptation?: Zuiko 50 mm f/1.8 (sharp affordable standard, $30-70), Zuiko 50 mm f/1.4 ($100-200), Zuiko 24 mm f/2.8 ($80-150), Zuiko 100 mm f/2.8 (compact short tele, $100-200), Zuiko 90 mm f/2 macro (1:2 native, $500-900), Zuiko 50 mm f/3.5 macro (1:2 native, $80-150). Olympus's compact-SLR design philosophy extended to the lenses, so the Zuiko line is famously small and light — well-suited to modern mirrorless body sizes.