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Olympus / OM System / Panasonic · Mirrorless mount

Micro Four Thirds — flange distance, protocol, and adapter compatibility

Open standard mirrorless mount co-developed by Olympus (now OM System) and Panasonic. 2× crop factor sensor with a 19.25 mm flange is well-suited to legacy-lens adaptation; the small image circle requirement means almost any full-frame lens covers it. Native AF-preserving EF adapter coverage is limited compared to E-mount.

Mount specifications

Flange focal distance
19.25 mm
Throat diameter
38 mm
Electronic protocol
Micro Four Thirds
Supported formats
MFT
Manufacturer
Olympus / OM System / Panasonic
Introduced
2008
Status
Active production

Adapting Micro Four Thirds lenses onto other bodies

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

Body mountResultAdapter examplesCaveats
Nikon Z
flange 16 mm
Mechanical
MFIS lens-onlyAp. wheelvignettes
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Micro Four Thirds lens and Nikon Z body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Canon RF
flange 20 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.
Canon EF-M
flange 18 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • 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.
Sony E (incl. FE)
flange 18 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • 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.
Fujifilm X
flange 17.7 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • 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.
Fujifilm GFX (G-mount)
flange 26.7 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • Speed Booster / focal-reducer family
  • Flange clearance is only -7.4 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.
L-Mount
flange 20 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.
Leica M
flange 27.8 mm
Speed booster
MFIS lens-onlyAp. wheelvignettes
  • Speed Booster / focal-reducer family
  • Flange clearance is only -8.6 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.

Adapting other lenses onto a Micro Four Thirds body

You own a Micro Four Thirds 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
Canon EF
flange 44 mm
Mechanical
MFIS lens-onlyAp. wheel2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon EF lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Canon EF-S
flange 44 mm
Mechanical
MFIS lens-onlyAp. wheel1.33× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon EF-S lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Nikon F
flange 46.5 mm
Mechanical
MFIS lens-onlyAp. wheel2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Nikon F lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Sony A / Minolta A
flange 44.5 mm
Mechanical
MFIS lens-onlyAp. wheel2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Sony A / Minolta A lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Fujifilm GFX (G-mount)
flange 26.7 mm
Mechanical
MFIS lens-onlyAp. wheel2.53× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Fujifilm GFX (G-mount) lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
M42 (Pentax / Praktica screw mount)
flange 45.46 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between M42 (Pentax / Praktica screw mount) lens and Micro Four Thirds body.
Leica M
flange 27.8 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Leica M lens and Micro Four Thirds body.
Pentax K
flange 45.46 mm
Mechanical
MFIS lens-onlyAp. wheel2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Pentax K lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
PL (Positive Lock)
flange 52 mm
Mechanical
——Ap. ring2× crop
  • Wooden Camera PL-MFT
  • Metabones PL-MFT
  • 2× crop applies — Super-35 PL primes give a ~4× full-frame equivalent. Useful on BMPCC 4K / 6K (BMPCC 4K is actually MFT mount), GH5, GH6.
Canon EF (cine)
flange 44 mm
Mechanical
MFIS lens-onlyAp. wheel2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Canon EF (cine) lens and Micro Four Thirds body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Exakta
flange 44.7 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Exakta lens and Micro Four Thirds body.
T-mount (T2)
flange 55 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between T-mount (T2) lens and Micro Four Thirds body.
C-mount
flange 17.526 mm
Mechanical
——Ap. ringvignettes
  • Generic C-MFT thin spacer (Fotodiox, Rainbowimaging, Kipon)
  • C-mount flange is 17.526 mm vs MFT's 19.25 mm — adapter is a thin 1.7 mm spacer. Most C-mount lenses focus past infinity through such an adapter; check per-lens.
  • Image circle is sized for 16 mm cine film (~13 mm diagonal). Only a handful of fast cine primes (Cosmicar / Pentax 25 mm f/1.4, Fujian 35 mm f/1.7) cover the MFT sensor; most others vignette into a tight central circle.
Praktica B
flange 44.4 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Praktica B lens and Micro Four Thirds body.
Konica AR
flange 40.5 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Konica AR lens and Micro Four Thirds body.
Minolta SR / MC / MD
flange 43.5 mm
Mechanical
MFIS lens-onlyAp. ring2× crop
  • generic mechanical adapter ring (multiple vendors)
  • Mechanical adapter only — no electronic communication between Minolta SR / MC / MD lens and Micro Four Thirds body.
Canon RF
flange 20 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.
Canon EF-M
flange 18 mm
Speed booster
MFIS lens-onlyAp. wheel1.33× crop
  • 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.
Nikon Z
flange 16 mm
Speed booster
MFIS lens-onlyAp. wheel2× crop
  • Speed Booster / focal-reducer family
  • Flange clearance is only -3.3 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.
Sony E (incl. FE)
flange 18 mm
Speed booster
MFIS lens-onlyAp. wheel2× crop
  • 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.
Fujifilm X
flange 17.7 mm
Speed booster
MFIS lens-onlyAp. wheel1.33× crop
  • 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.
L-Mount
flange 20 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.
Canon RF (cine)
flange 20 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.

References

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