I am learning so much! I have ordered three books from Amazon on photography that were recommended from here, and have been searching/reading here and also the Internet. I don't have a dSLR camera just yet and I am looking at the Canon EOS Rebel T1i 500d without the kit lens. I want to get an EF-S 18-200mm lens or thereabouts. But I have some questions about lenses. I can't resist asking questions if you don't mind! I've reviewed the 450d because I assume that compatibility with 450d will be similar to the 500d. i.e., body is plastic, dimensions and weight are the same, etc. I understand EF and EF-S is the mount for the lens. I have only seen one 18-200mm lens and it is a Canon and an EF-S. I really can't get a good feel about lens compatability from all that I have read. What do you think of the Canon lenses? If a camera is an EF EF-S, then is it limited to only those lenses? What are the good brands of lenses I should be looking at? Thanks so much.