The 17-35 Tamron SP AF17-35/2.8-4 Di LD Aspherical (IF) is a digital only lens, correct?
It also works on film cameras and FF sensors -- although I can't imagine that someone shells out $3k on a Canon 5D and then buys such a cheap lens.
My point is that this lens is mainly aimed at people with analog (read: film) bodies who also want to use it on their digital body. The `Di' moinker is marketing speech for `designed with digital cameras in mind'; usually that means it only works on dslrs.
However, my main argument remains: that particular focal range is definitely not appealing for someone with a dslr. Either take a 12-24 zoom or 17-50.