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This may be a bit late, but I've found the Canon 35mm f/2 (non IS) to be a fantastic astro lens, very sharp, and on my cameras infinity focus is right at the stop so finding astro focus can be done in the dark with the camera turned off!
It also equates to almost a 'standard' lens on a crop camera.
I think I posted some examples here a couple of years ago.
Cheers,
Jason.
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