I know very little about photography. My wife has always wanted a fisheye lens and I asked a very helpful person at Calumet in Cambridge about the EF 15mm Fisheye. He informed me that the 10d does not have the chip to make it true 35mm, that the "Focal Length" will only go to 22 or so and I would not get the real "fisheye" effect with the lens. can any of you experienced photographers chime in on this one for me or perhaps make a suggestion? if you have I.M. my screen name is seasidecycle. thanks and have a great holiday. scott b.