I put my old Minolta AF 70-210mm f/4 lens on my 507si body and took a couple pics. Man, this is a great lens! It’s got a constant f/4 aperture, and is very sharp, but the autofocusing is real slow, and it is a heavy lens. Using a tripod with this lens is a must, especially when zoomed to 210mm. I can’t wait for the Minolta Digital SLR to come out so I can try this lens on it. It’s no fun taking a picture, then waiting for the film to be developed. Not to mention having to take all 24 or 36 photos before even taking the film to the developer! I have been spoiled by my digital cameras, I suppose.