You can mount it, and crop, but I just don't need anything that wide on my just purchased 5D2.
I am selling my two month old perfect one because I sold my two cop bodies already. I'm down to one body i'm all full frame. Pm me if interested. mine is sharp and perfect on both the 450D and 500D bodies, warranty hasn't even been filled out and sent in. I would take 400 plus shpping for mine, I paid 489 two months ago, June 1st