با اجازه جناب قشقایی،
ظاهراً بجز vignetting شدید و عدم کارکرد اتوفکوس مشکلات دیگری هم بوجود می آید.
I was asked the question, so I had to find out for myself. The Canon EF-S 17-55mm f/2.8 IS USM Lens mounted on a Canon EOS 1Ds Mark III
[IMG]http://i25.*******.com/2jb7ip5.jpg[/IMG]
With the help of a 12mm Extension Tube, you can physically mount this EF-S lens on a full frame body. But you probably will not want to. The image above shows the image circle as seen through this combination by a Canon EOS 1Ds Mark III. In addition to the heavy vignetting, AF does not work and the aperture information does not report to the camera. Even in MF mode, more hurdles remain - at 55mm, the 17-55 will not focus any farther away than about 7" or so in front of the lens. This distance rapidly decreases as the focal length is widened until the subject is against the glass and beyond this point no subject can be in-focus. It was a fun exercise at least - and now we know.
کد:
http://www.the-digital-picture.com/Canon-News/