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Sounds like you have two lenses. They are probably different sizes and you have a UV filter for each lens. The UV filters are generally jut used to protect the lens. You just leave them on all the time, and they take all the abuse. You'll need to clean them off periodically. Filtering out the UV doesn't do much of anything for the photographs.
I'm not away of any good basic photography websites out there, but I'm sure they exist.
Exciting!
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