Lens For Canon Rebel

Robert asks…What kind of telephoto converter should I get for my Canon Rebel XT?I want to get more length out of my 18-55mm f3.5-5.6 Lens for my Canon Rebel XT without buying a really expensive lens. So I thought I'd look for a telephoto converter but I don't know which type to get because I'm not sure if there is a certain type I need to look for. Thanks in advance.mr.eos answers:The other problem with converters is the affect on autofocus. I think most Canons need a maximum aperture of at

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