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Anonymous
I use a rebel xt myself, and I ended up just getting the kit lens to learn with, and later grabbed a 100-300mm lens, as well as a 50mm f/1.8 one...
USM I believe stands for Ultrasonic Motor, meaning, If you have it set to auto focus, it will focus in very quickly, and silently. Other good thing about it is the lens itself won't expand or contract when you focus so if your doing some super close up stuff, you won't have to worry about the lens actually touching the object.
If you want something a bit better than the kit lens, the Canon EF 28-80mm f/3.5-5.6 II, is pretty good. And since I don't really know is the name looks intimidating or not, I'll break it down anyways.
Canon EF - The Brand and series of the lens, certain SLR's can only use lens's from certain series, so your usually going to want to make sure that the lens is compatible with the camera/ 28-80mm - The Focal Length, the lower the number, the more stuff you can fit into a picture, the higher, the more zoomed in you are. If it's a range, like this, then it's a zoom lens, if it's just a single number, then it's a prime lens. Zoom's offer the utility of, well, zooming, while prime lens' offer slightly higher quality shots, though unless your going for absolutely professional shots, the difference won't be too big. Prime lens' also tend to be slightly faster, and cheaper. f/3.5-5.6 The F-Stop/Aperture setting. The lower this number, the more wide open/Faster the lens is. A faster lens can be used at a lower shutter speed because the lens allows more light into the lens. When it's in a range like this, it's representing how open the lens is at both end of the zoom. So at 27mm, it would be 3.5, and at 80mm, it would be 5.6.
I'm pretty sure all this is correct, but I just started learning a couple months ago, and It would seem I've a long way to go.
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