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One thing I appreciated about the F-mount is that it could be used on both full-frame (FX) cameras as well as cropped (DX) cameras. * https://www.nikonusa.com/

One thing I appreciated about the F-mount is that it could be used on both full-frame (FX) cameras as well as cropped (DX) cameras. * https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/the-dx-and-fx-formats.html https://www.nikonusa.com/en/learn-and-explore/a/products-and... With Canon there were two systems and there was no compatibility between the two (IIRC). * https://en.wikipedia.org/wiki/Canon_EF-S_lens_mount https://en.wikipedia.org/wiki/Canon_EF-S_lens_mount * https://en.wikipedia.org/wiki/Canon_EF_lens_mount https://en.wikipedia.org/wiki/Canon_EF_lens_mount (There were/are less expensive DX-only lenses as well.)

t0mas88 5y ago
Canon EF is like Nikon F, it works on both types of cameras. Canon EF-S is what Nikon calls DX-only, cheaper but only works on smaller sensor cameras.
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to11mtm 5y ago
EF and EF-S are 'compatible' but only in one direction. EF-S Cameras can take both EF and EF-S lenses. You can't go the other way; on EF Cameras, an EF-S lens will probably not fit and even if it does may damage the camera (i.e. mirror might hit the back of the lens due to clearance differences.)
- turtletontine 5y ago
  There's a pretty simple reason for this: ef-s lenses are designed for a smaller sensor, so they only need to be sharp for a much smaller area. So you can make lighter and cheaper lenses. Canon doesn't want people putting ef-s lenses on full frame cameras and complaining that the image edges look like crap - because, well, they're not meant for that.
  - I_AM_A_SMURF 5y ago
    Don't EF-S lenses need to produce a smaller image in general? I always thought that if you somehow put an EF-S on a full frame sensor you would get a circle image similar to a fish eye.
    - turtletontine 5y ago
      Hmm I doubt it would look like a fisheye. The edges would appear darkened and soft, and there would maybe be extra barrel or pincushion distortion.

t0mas88 5y ago

Canon EF is like Nikon F, it works on both types of cameras. Canon EF-S is what Nikon calls DX-only, cheaper but only works on smaller sensor cameras.

deleted 5y ago

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to11mtm 5y ago

EF and EF-S are 'compatible' but only in one direction. EF-S Cameras can take both EF and EF-S lenses. You can't go the other way; on EF Cameras, an EF-S lens will probably not fit and even if it does may damage the camera (i.e. mirror might hit the back of the lens due to clearance differences.)

turtletontine 5y ago
There's a pretty simple reason for this: ef-s lenses are designed for a smaller sensor, so they only need to be sharp for a much smaller area. So you can make lighter and cheaper lenses. Canon doesn't want people putting ef-s lenses on full frame cameras and complaining that the image edges look like crap - because, well, they're not meant for that.
- I_AM_A_SMURF 5y ago
  Don't EF-S lenses need to produce a smaller image in general? I always thought that if you somehow put an EF-S on a full frame sensor you would get a circle image similar to a fish eye.
  - turtletontine 5y ago
    Hmm I doubt it would look like a fisheye. The edges would appear darkened and soft, and there would maybe be extra barrel or pincushion distortion.