What causes the black ring around the image? On the 10mm - something (forgotten), because even when zoomed in to 24mm the ring is still there.messiah khan said:The Sigma 12-24 should work I think.
Those are really nice.messiah khan said:The Canon 1Ds MKII is full frame isn't it? If so, then the Sigma 12-24 will work. See the following link for proof;
http://www.talkphotography.co.uk/forums/showthread.php?t=29494&highlight=pushing+wide
![]()
Edit: Scratch that, I misread.robmiller said:If you're going to just say "the widest lens", then there are a few 8mm fisheyes that will work on a full-frame Canon. The widest Canon-made lens and the widest zoom that will work is the 12-24, though.