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I doubt that the 75-300 would be any better. The 50mm f1.8 standard canon lens is inexpensive and quite a good lens for the money.. (I assume by 55mm lens you mean the 18-55 standard kit lens) I think ponders has the 50mm so he may be able to give you more specific info. The Canon L series lenses would certainly be a better option but I've seen lots of reports of poor QC. Striker has just bought an L series 17-40, it would be worth asking him how it performs on astro photos.
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