Say, I got a 30D and when shopping for telephoto or other lenses how do I know which ones fit for it? Like on B&H won't tell me which ones fit on it.thanks,Alank

Any EF or EF-S will fit.

As far Canon lenses any EF or EF-S will fit on your 30D. If you're looking at third party lenses from Sigma, Tamron, etc then look for lenses for Canon EOS.I've collected links to reviews for many EOS compatible lenses here:http://www.canon-reviews.com/reviews/lenses

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