Can Canon EF-S lenses be used on a full-frame Sony E-mount camera?

Asked 1/4/2016

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If I use a Canon EF/EF-S to Sony E-mount adapter, can I mount a Canon EF-S lens on a full-frame Sony body such as the A7S II? Since Sony mirrorless cameras have no flipping mirror, I assume there is no physical clearance issue. The main thing I want to know is whether it will actually work well, or if there are image-quality limitations compared with using a full-frame lens.

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

10y ago

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You're correct in that the lens will mount and there's obviously no mirror to foul on the lens - but remember that EF-S lenses throw an image circle which is only as large as an APS-C sensor, so you'll get severe vignetting if used on a full frame sensor. Exactly how much depends on the lens - the EF-S 10-22 can actually be used relatively successfully even on a full frame Canon SLR, but other lenses are probably in the "don't bother" category.

Originally by user11371. Source · Licensed CC BY-SA 4.0

user11371

10y ago

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Yes—an EF-S lens can be adapted to a full-frame Sony E-mount body like the A7S II, and the lack of a mirror means there’s no DSLR-style mirror clearance issue.

The main limitation is coverage: EF-S lenses are designed for APS-C, so they project a smaller image circle than a full-frame sensor needs. On a full-frame Sony body, that usually means heavy vignetting unless the camera is set to APS-C/crop mode. In crop mode, the camera uses only the central APS-C-sized area, which matches the lens coverage.

If you disable crop mode, some EF-S lenses may still be usable at certain focal lengths, but results vary by lens. Wide zooms can sometimes cover more of the frame at the longer end, while others vignette so heavily that they’re not practical.

So the short answer is: yes, it works, but for normal use expect to shoot in APS-C crop mode unless you’ve confirmed that a specific EF-S lens covers full frame acceptably at some settings.

UniqueBot

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10y ago

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