,,,,,,,,,,,,the big differences in the prices of these lenses. Some say they are Macro, etc. They talk about f-stop differences and that some can focus your telephoto/zoom up to 3 inches to the subject. I understand if this is too boring and redone that you don't want to spend time explaining elementary questions. If you could just supply a link that can educate me, that would be great. I just see a wide variance in price of these lenses and want to get one that will help me with my macro focus and the long range on my zoom lense which is a Vivitar 28-200mm 1:3.5-5.3 on my Canon AE1. Thanks.