Tokina AF 50-135mm f/2.8 AT-X Pro DX To be exact. I have one for sale here on FM.. We sold our 7D and have only 1D / 5D series cameras now.. I have always read that EF-s lens would not work on FF cameras.. But, a potential buyer ask if it would work so I tried it on my 1DsII... Other than vignette at 50mm it seemed to work fine... What gives ?? Do I have an anomaly, or will this lens damage the camera?? any help would be appreciated. Jim
AFAIK ... it is the mostly the point that the image circle doesn't project sufficiently to cover the larger FF sensor area.
I had read a recommendation once that the UWA Tokina DX zooms could be used on the APS-H as long as you stop down to offset the vignetting. I mounted one (store test) on my 1D MK II N (1.3X) to see how the image IQ / vignetting of the smaller DX projection would work.
Functionally, everything seemed to work just fine. I passed on this as a solution for me as the FL range / vignetting / aperture / IQ combinations weren't quite what I was looking for, particularly the vignetting @ the wider settings.
Based on my experience/observation ... I'd not worry too much.
BTW ... the (Canon dealer) store didn't "freak out" (like I would be hurting their lens or my camera by doing so) when I tried to use their DX on my II N. They looked at me odd as to why I would try it, but they expressed no worries about damage.
EF-S lenses won't work on FF cameras because they use a different mount, but only Canon uses the EF-S mount. All the third party manufacturers use the standard EF mount and the "crop only" versions of their lenses simply don't cover the entire sensor area for FF. So mounting them is no problem and you won't hurt anything, but as you noticed you won't get full coverage at all the focal lengths.
Typically only the canon EF-s lenses protrude into the mirror box which is why the mount is slightly different to prevent mounting them on a FF body and getting a mirror strike, but as you see the after market lenses don't. So all is fine.
LightShow wrote:
Typically only the canon EF-s lenses protrude into the mirror box which is why the mount is slightly different to prevent mounting them on a FF body and getting a mirror strike, but as you see the after market lenses don't. So all is fine.
Interesting to know about EF-S lenses protruding into the body. I know that some users modified a few EF-S lenses to mount on FF so this is likely not true of all EF-S lenses.
curious80 wrote:
Interesting to know about EF-S lenses protruding into the body. I know that some users modified a few EF-S lenses to mount on FF so this is likely not true of all EF-S lenses.
This is often done to use the 10-22 on APS-H.
EF-S lenses do indeed protrude into the mirror box, but oftentimes it's possible to disassemble the mount and remove the very bottom part. AFAIK all Canon EF-S lenses would block a FF mirror unmodified, but usually there is just a small plastic/rubber ring at the very back of the lens that does this and can be removed.
Here is a good picture illustrating a crop lens with an EF mount and the 10-22. If the bottom part of the 10-22 is removed, it's possible to mount it on any EOS body.
Edit: Third party manufacturers use the EF mount for their APS-C lenses because that's how Nikon does it and it's easier for compatibility purposes to just make EF and F-mount versions than EF-S and F. The difference between crop and full frame lenses on non-Canon mounts is just the size of the image circle. On a side note, you'll also often see many third-party lenses zoom and focus the "wrong way" compared to Canon, as everything is backwards in Nikonland.
