What's the best body to adapt the Canon EF 40mm f/2.8 STM onto?

Two strong destinations. First choice: a Canon RF body via the Canon EF-EOS R preserves the most of the EF 40 f/2.8 STM's native behaviour (autofocus, in-lens IS where present, electronic aperture). Second choice: a Canon EF-M body via the Canon EF-EOS M — solid fallback when the first body family is unavailable. The /matrix and /picker pages let you compare every feasible adaptation side-by-side.

Will autofocus work when the EF 40 f/2.8 STM is adapted onto another body?

Yes — on a Canon RF body through the Canon EF-EOS R, full AF is preserved on the EF 40 f/2.8 STM. Single-shot AF and continuous-tracking AF both work, though tracking quality varies with the specific lens generation and adapter firmware revision.

Does the EF 40 f/2.8 STM's in-lens image stabilization still work through an adapter?

The EF 40 f/2.8 STM has no in-lens IS / VR / OS unit — there's no in-lens stabilisation to pass through. Bodies with IBIS (most modern mirrorless) still stabilise the captured frame, but stabilisation is body-side only.

Canon · Canon EF mount · Prime lens

Canon EF 40mm f/2.8 STM — adapter compatibility and body matches

The Canon EF 40mm f/2.8 STM sits on the Canon EF flange geometry (44 mm) — below is every body mount it adapts onto, the autofocus / IS / aperture-control level you should expect, and the specific adapter SKUs that ship the path.

Lens specifications

Manufacturer: Canon
Lens mount: Canon EF
Focal length: 40mm
Aperture: f/2.8 – f/22
Lens type: Prime
Image stabilization: No
Weight: 130 g
Filter thread: 52 mm
Released: 2012

Background & adapter context

Canon's EF pancake — 130 g and barely longer than a body cap. Its quiet STM focus motor was built for video, and adapted onto a small mirrorless body it makes one of the most pocketable adapted-lens combinations going.

Adapting the EF 40 f/2.8 STM onto other bodies

Every feasible body-mount destination for a Canon EF lens, sorted by adapter feasibility. Curated adapter SKUs (linked below) cover the specific lens-side → body-side pairing — pick the row matching the body you own, then click the SKU for the full teardown.

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 Viltrox EF-EOS R5 (autofocus EF-to-RF) Commlite CM-EF-EOS R	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 Metabones EF-E Mark V Metabones Speed Booster ULTRA 0.71× EF-E Viltrox EF-NEX IV (EF-E) Fotodiox Pro EF-NEX Kipon Baveyes EF-FE 0.7x Commlite CM-EF-NEX HS Fotodiox Vizelex ND Throttle EF-NEX	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 Kipon Baveyes EF-FX 0.7x	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	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	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	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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.

About the Canon EF mount

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.

See every adapter that touches the Canon EF mount →

Common questions

What's the best body to adapt the Canon EF 40mm f/2.8 STM onto?: Two strong destinations. First choice: a Canon RF body via the Canon EF-EOS R preserves the most of the EF 40 f/2.8 STM's native behaviour (autofocus, in-lens IS where present, electronic aperture). Second choice: a Canon EF-M body via the Canon EF-EOS M — solid fallback when the first body family is unavailable. The /matrix and /picker pages let you compare every feasible adaptation side-by-side.
Will autofocus work when the EF 40 f/2.8 STM is adapted onto another body?: Yes — on a Canon RF body through the Canon EF-EOS R, full AF is preserved on the EF 40 f/2.8 STM. Single-shot AF and continuous-tracking AF both work, though tracking quality varies with the specific lens generation and adapter firmware revision.
Does the EF 40 f/2.8 STM's in-lens image stabilization still work through an adapter?: The EF 40 f/2.8 STM has no in-lens IS / VR / OS unit — there's no in-lens stabilisation to pass through. Bodies with IBIS (most modern mirrorless) still stabilise the captured frame, but stabilisation is body-side only.

Lens specifications

Background & adapter context

Adapting the EF 40 f/2.8 STM onto other bodies

About the Canon EF mount

Common questions

Keep exploring