Can I adapt Canon EF lenses to Fujifilm X-mount with autofocus?

Yes — the Fringer EF-FX Pro II and EF-FX III preserve AF, IS, and electronic aperture on most modern Canon EF lenses with continuous compatibility updates pushed over a USB-C firmware port on the adapter itself. Older Viltrox EF-FX1 adapters cover the same ground at lower cost but with slower AF acquisition. Image quality through pure mechanical EF→FX adapters (no glass) is unaffected.

What's the largest sensor size that fits Fujifilm X-mount?

APS-C only — Fujifilm reserves their medium-format mount for the GFX line under the separate G-mount name. Every X-mount body (X-T5, X-Pro3, X-H2, X-H2S, X-T50, X-T30 II) uses a 23.5 × 15.6 mm APS-C sensor. The 17.7 mm flange and 44 mm throat were designed around APS-C image-circle requirements; the geometry would not support a full-frame sensor at the same flange depth.

Will Fujifilm GFX lenses fit on an X-mount body?

No — GFX uses the larger G-mount (26.7 mm flange, 65 mm throat) and is medium-format-only. No Fujifilm or third-party G-to-X adapter exists; the physical interfaces are too different to bridge with a passive ring. Fujifilm's only cross-system path is the GF-to-X teleconverter for specific GF lenses, but that operates inside the GFX system on GFX bodies, not on X-mount bodies.

Fujifilm · Mirrorless mount

Fujifilm X — flange distance, protocol, and adapter compatibility

Fujifilm's APS-C mirrorless mount. Shallow 17.7 mm flange makes it one of the easiest targets for legacy-lens adaptation; mechanical adapters exist for almost every SLR and rangefinder mount. AF-preserving adapters from Canon EF (Fringer EF-FX) cover much of the EF lineup.

Mount specifications

Flange focal distance: 17.7 mm
Throat diameter: 44 mm
Electronic protocol: Fujifilm X
Supported formats: APS-C
Manufacturer: Fujifilm
Introduced: 2012
Status: Active production

Fujifilm X on the flange-distance axis

Fujifilm X sits at 17.7 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 Fujifilm X lenses onto other bodies

You own Fujifilm X 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 RF flange 20 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.	Speed Booster equivalence calculator Plug in any Fujifilm X lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Canon RF (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 Canon EF-M flange 18 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -0.3 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 Fujifilm X lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Canon EF-M (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 Z flange 16 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only 1.7 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 Fujifilm X lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Nikon Z (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 E (incl. FE) flange 18 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -0.3 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 Fujifilm X lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Sony E (incl. FE) (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 Fujifilm GFX (G-mount) flange 26.7 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	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 Fujifilm X 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. 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 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. 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.	Speed Booster equivalence calculator Plug in any Fujifilm X 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. 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 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. 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.	Speed Booster equivalence calculator Plug in any Fujifilm X 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. 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 Leica M flange 27.8 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -10.1 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 Fujifilm X 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. 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 Fujifilm X body

You own a Fujifilm X 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 flange 44 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).
Lens mount Canon EF-S flange 44 mm	Mechanical AF fullIS fullAp. electronic	Fringer EF-FX Pro II Fringer EF-FX2	Fringer drives phase-detect AF, IS and electronic aperture on EF-S lenses just as on EF — EF-S behaves as native EF electronically. Unlike full-frame EF glass (which is 1.5× cropped on X-Trans), an EF-S lens's APS-C image circle matches the X-mount APS-C sensor exactly — no coverage wasted, no crop penalty.
Lens mount Canon RF flange 20 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.
Lens mount Canon FD flange 42 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon FD lens and Fujifilm X body.
Lens mount Nikon F flange 46.5 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Nikon F lens and Fujifilm X 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. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Sony A / Minolta A lens and Fujifilm X 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. wheel1.9× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Fujifilm GFX (G-mount) lens and Fujifilm X body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Lens mount L-Mount flange 20 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and Fujifilm X 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. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between M42 (Pentax / Praktica screw mount) lens and Fujifilm X body.
Lens mount Leica M flange 27.8 mm	Mechanical MFno ISAp. ring1.5× crop	Voigtländer VM-X Close Focus Generic M-FX rings	Manual focus only; APS-C crop turns 50 mm M-mount into a ~75 mm equivalent.
Lens mount Pentax K flange 45.46 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Pentax K lens and Fujifilm X 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. ring1.5× crop	Fotodiox Pro PL-FX Kipon PL-FX	1.5× crop on X-Trans means most full-frame PL primes give a ~Super-35-equivalent field of view — close to the original Super-35 framing those lenses were designed for.
Lens mount Canon EF (cine) flange 44 mm	Mechanical MFno ISAp. electronic1.5× crop	Fringer EF-FX Pro II Fringer EF-FX2	1.5× crop applies — a 50 mm EF-cine prime becomes a ~75 mm equivalent on X-Trans. Aperture pass-through works; AF is moot (cine prime has no motor).
Lens mount Canon RF (cine) flange 20 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon RF (cine) lens and Fujifilm X body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Lens mount Exakta flange 44.7 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Exakta lens and Fujifilm X body.
Lens mount T-mount (T2) flange 55 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between T-mount (T2) lens and Fujifilm X body.
Lens mount C-mount flange 17.526 mm	Mechanical MFno ISAp. ringvignettes	Generic C-FX rings (Fotodiox, Kipon)	APS-C sensor (~28 mm diagonal) is more than 2× the C-mount image circle — heavy vignetting on every lens. Image is usable only with a heavy central crop. C-mount flange 17.526 mm vs X-mount 17.7 mm — clearance is fractional and most lenses cannot reach infinity focus on X-mount.
Lens mount Praktica B flange 44.4 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Praktica B lens and Fujifilm X body.
Lens mount Konica AR flange 40.5 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Konica AR lens and Fujifilm X body.
Lens mount Minolta SR / MC / MD flange 43.5 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Minolta SR / MC / MD lens and Fujifilm X body.
Lens mount Olympus OM flange 46 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.
Lens mount Contax/Yashica (C/Y) flange 45.5 mm	Mechanical MFno ISAp. ring1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Contax/Yashica (C/Y) lens and Fujifilm X body.
Lens mount Canon EF-M flange 18 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.3 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 Nikon Z flange 16 mm	Speed booster MFIS lens-onlyAp. wheel1.5× crop	Speed Booster / focal-reducer family	Flange clearance is only -1.7 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 Sony E (incl. FE) flange 18 mm	Speed booster MFIS lens-onlyAp. wheel1.5× crop	Speed Booster / focal-reducer family	Flange clearance is only 0.3 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 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.

Adapter SKU teardown

Curated adapter SKUs that involve the Fujifilm X 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.

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.
Urth Nikon F to Fuji X
released 2020
Nikon F lens → Fujifilm X body
- no firmware updates
- not weather sealed
- no glass — pass-through
- Nikon F (AI / AI-S / AF-D / G-type) onto Fujifilm X-mount APS-C bodies (X-T5 / X-H2S / X-H2 / X-Pro3 / X-S20). Built-in stop-down ring for G-type Nikkors that lack an aperture ring on the lens.
- Recycled-aluminum body, anodised matte-black finish, plastic-free packaging, tree-planting commitment per product.
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.

References

https://en.wikipedia.org/wiki/Fujifilm_X-mount

Common questions

Can I adapt Canon EF lenses to Fujifilm X-mount with autofocus?: Yes — the Fringer EF-FX Pro II and EF-FX III preserve AF, IS, and electronic aperture on most modern Canon EF lenses with continuous compatibility updates pushed over a USB-C firmware port on the adapter itself. Older Viltrox EF-FX1 adapters cover the same ground at lower cost but with slower AF acquisition. Image quality through pure mechanical EF→FX adapters (no glass) is unaffected.
What's the largest sensor size that fits Fujifilm X-mount?: APS-C only — Fujifilm reserves their medium-format mount for the GFX line under the separate G-mount name. Every X-mount body (X-T5, X-Pro3, X-H2, X-H2S, X-T50, X-T30 II) uses a 23.5 × 15.6 mm APS-C sensor. The 17.7 mm flange and 44 mm throat were designed around APS-C image-circle requirements; the geometry would not support a full-frame sensor at the same flange depth.
Will Fujifilm GFX lenses fit on an X-mount body?: No — GFX uses the larger G-mount (26.7 mm flange, 65 mm throat) and is medium-format-only. No Fujifilm or third-party G-to-X adapter exists; the physical interfaces are too different to bridge with a passive ring. Fujifilm's only cross-system path is the GF-to-X teleconverter for specific GF lenses, but that operates inside the GFX system on GFX bodies, not on X-mount bodies.

Mount specifications

Fujifilm X on the flange-distance axis

Adapting Fujifilm X lenses onto other bodies

Adapting other lenses onto a Fujifilm X body

Adapter SKU teardown

Fringer EF-FX Pro II

Urth Nikon F to Fuji X

Kipon Baveyes EF-FX 0.7x

References

Common questions

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