jerryc41 wrote:
I've bought several used lenses, and one thing I learned is that a 70-200mm, for example, from any brand will have several different versions to choose from. Just because it is a 70-200mm (or whatever) doesn't mean it's the lens you want. Read the total description and name of the lens. Just a letter or two difference in the name of the lens can differentiate a new model from an old one that you don't want.
Amen to that and pay attention to the reviews as well. I bought a used Canon 28-200 3.5-5.6 USM in excellent condition. The reviews on this lens say it is terrible. I couldn't believe a lens could be that bad but it is. It is so bad I won't sell it to anyone else, I don't want anyone thinking bad about me the rest of my life. :D