Canon EF lenses on Sony E

26 mm flange clearance autofocus with caveats

Does a Canon EF lens fit a Sony E body?

Yes, with a simple adapter and no loss of image quality. Canon EF has a flange focal distance of 44.0 mm and Sony E has 18.0 mm, leaving 26.0 mm for the adapter to occupy. Because the adapter contains no glass, the lens performs exactly as it does on its native mount.

The most common adaptation in the world, and the one with the widest gap between what the listings promise and what you get. EF glass is cheap and plentiful, Sony bodies are good, and the adapters genuinely work — but “works” here means single-shot stills are close to native while continuous tracking is a lottery decided by your particular lens. If you already own EF lenses, adapting them is a sound way to start on Sony. If you are buying lenses specifically to adapt, native FE glass is the better answer; Sony E has the largest third-party autofocus catalogue of any mirrorless mount.

Autofocus: Autofocus, with caveats

Autofocus works, and for single-shot stills it is close to native. Continuous tracking and eye detection are where it falls down, and how badly depends far more on the individual lens than on the adapter — ring-USM lenses of the 1990s behave differently from modern STM and Nano-USM designs, on the same adapter, on the same body.

Sigma is explicit that the MC-11 supports Sigma’s own SA-mount lenses and Sigma’s own Canon EF-mount lenses. It drives many Canon-branded lenses in practice, but that is unsupported behaviour and Sigma makes no promise about it.

What to watch for

There is no adapter that makes every EF lens behave. Check your specific lens before buying, and treat any “full compatibility” claim on a listing as marketing.

Buying used needs one extra check. Metabones states that all its current Sony E-mount adapters are full-frame ready, with the exception of the discontinued EF to E-mount Smart Adapter Mark I and Mark II. Those early versions turn up cheap secondhand and are not a bargain if your body is full-frame.

What “autofocus works” actually covers

Three things are usually bundled together under autofocus, and they degrade at different rates. Acquiring focus on a static subject in good light is reliable and quick enough that most people stop noticing the adapter. Continuous tracking of a moving subject is where the translation overhead shows, and it can range from usable to hopeless depending on the lens. Eye and face detection often work but more slowly than with native glass, and they are the first thing to fail in low light.

None of this is a defect in a particular adapter. The adapter is relaying a conversation between two systems that were never designed to speak, and how well that goes depends on how the lens’s focus motor responds to being driven that way.

Aperture, stabilisation and EXIF

The electronic side is the good news. Sony E bodies control aperture electronically rather than through a mechanical lever, which is precisely why this adaptation is tractable at all — Sigma makes that point about the MC-11 explicitly. Aperture is set from the camera as normal, EXIF passes through, and the lens’s own optical stabilisation continues to work along with the camera’s correction profiles for vignetting and chromatic aberration.

Speed boosters are a different product

Alongside the plain adapters, Metabones sells Speed Booster versions that contain glass, compress the full-frame image circle onto a smaller area and recover about a stop of light. On a full-frame Sony body that is the wrong tool: Metabones notes that its full-frame cameras switch to APS-C crop mode automatically when a Speed Booster is fitted, which cancels the point of owning a full-frame body. Speed boosters make sense adapting a larger format down to a smaller sensor, not across to the same size.

Adapters

Sigma MC-11 — Sigma (mechanical, no glass). Check price on Amazon UK. The sensible buy if your EF lenses are Sigma’s, which is what Sigma supports. Carries per-lens data for tuned autofocus and aperture, and passes camera correction profiles through.
Metabones Smart Adapter Mark V — Metabones (mechanical, no glass). Search Amazon UK. The broad-compatibility option, aimed at EF lenses generally rather than one maker’s. Make sure you are getting the Mark V — Metabones excludes the discontinued Mark I and Mark II from its full-frame-ready range.
Viltrox EF-E5 — Viltrox (mechanical, no glass). Check price on Amazon UK. The budget end, and competent for static subjects. Expect continuous tracking to be the first thing that disappoints.

What does not work

Reliable continuous autofocus tracking. Some lens and adapter combinations manage it; none of the makers promise it across the catalogue, and no listing’s claim is worth trusting over a test with your own lens.
Canon-branded lenses as a supported configuration on the Sigma MC-11. They frequently work; Sigma’s support covers Sigma’s own lenses.
Full-frame coverage from a used Metabones Smart Adapter Mark I or Mark II, which Metabones excludes from its full-frame-ready statement.
The reverse direction. Sony E lenses will not adapt to a Canon EF body — E sits 26 mm closer to the sensor, so infinity focus is gone.

Sources

Flange focal distances: Canon EF 44.0 mm, Sony E 18.0 mm.