The EF stands for electro focus; the S, for short back focus. And no, you don't really need to remember that little detail — but you do need to make sure that if you buy a Canon lens other than the one sold with the camera, it carries either the EF or EF-S specification. (If you want to buy a non-Canon lens, check the lens manufacturer's Web site to find out which lenses work with the Rebel XS/1000D.)
Whatever lens you choose, follow these steps to attach it to the camera body:
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.