Will an adapted EF circular fisheye be cropped on a Canon EOS M6 (EF-M)?
Asked 2/8/2018
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I’m looking for a circular fisheye for a Canon EOS M6, but I can’t find one in native EF-M mount. If I use an EF/EF-M adapter with an EF-mount fisheye such as the Sigma 4.5mm f/2.8, will the circular image be cropped? Does adapting EF to EF-M change the fisheye coverage or projection compared with using the lens on an APS-C DSLR?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
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It will work as expected. Any fisheye that projects a circular uncropped image on an EF-S camera does so also when attached to an EF-M mount with an EF/EF-M adapter. Correspondingly, the image of a full-frame circular fisheye gets cropped like it would with an EF-S camera. The sensor size being the same (APS-C), any adapted lens functions optically exactly like when attached to a native EF-S body.
Originally by user14547. Source · Licensed CC BY-SA 4.0
user14547
8y ago
0
Generated from our catalog & community — verify before relying on it.
Adapting EF to EF-M does not change the lens’s optical behavior. The EOS M6 has an APS-C sensor, so an adapted EF lens will look the same as it would on a Canon APS-C DSLR.
That means:
- If the fisheye produces a circular image on APS-C, it will still do so on the EOS M6.
- If it is a full-frame circular fisheye, the image will be cropped on APS-C exactly as it would be on an EF-S camera.
So the key factor is sensor size and the lens’s intended image circle, not the adapter. An EF-M adapter just provides the correct mount spacing; it doesn’t crop the image by itself.
Canon does not make a native EF-M circular fisheye, and they also didn’t make an EF-S circular fisheye. A lens like the Sigma 4.5mm f/2.8 DC, which is designed for APS-C, is the kind of lens to look at if you want a circular fisheye effect on the M6.
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