I'm new here and new to DSLRs. I bought a Rebel XT body new, but being a student, can only afford used lenses. So far I have a Canon 28-80mm and am hoping to get a telephoto or macro. Because of price restrictions, I have two main offers, but wanted an opinion as to which is a better quality lens. I can get either: A Seikanon MC Auto Zoom 1:4.5 75-200mm or a Tamron 80-200mm (both are for pretty much the same price) Ideally I'd love to get a 75-300 or something nicer, but right now this is the best I can afford and would like to hear your thoughts. Thanks!