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What sort of focal length are you looking to use for your images? If you don't want star trails then you need a fairly short focal length when operating from a fixed tripod. A 50mm lens will give you about 14 sec of exposure before trailing, a 24mm nearly 30 sec. A 300mm lens will only give you around 2 sec. After these times your stars will start to trail and elongate.
You will also need a quick lens to be able to capture as many stars as possible in that short time, f1.8 - f2.8 would be good to start with.
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