So I was looking at B&H for Canon lenses for a Rebel XT. When I clicked on lenses it gives the option of "digital SLR" or "digital/film SLR." First of all, what is the difference between these two categories? I assume digital only is most likely better for digital cameras which brings me to my second question--I only saw shorter lenses (all under 100mm) in the digital only category. Do they make, for example, the 70-300mm for digital only (and as I asked initially, does it matter if it's digital only or not). Thanks for the help!