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Thanks a lot for all the info guys, looks like I've got a fair amount more of researching to do. From all the info I've received, it seems that maybe the Canon EF 17-40mm F/4L may not provide the best value for money when it comes to astrophotography...correct me if I'm wrong on that one.
Also note that I currently don't have any tracking capabilities, so the lens would be used just for short, straight exposures of the sky.
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