Bojan - I'm yet to see someone complain about the optical quality of the nifty fifty from Canon. Sure, build quality yes, optical quality, no. I spent quite a while on POTN's equipment sub forums and never saw it bashed. Yours is the first that I've personally seen bashing the lens in question. It's a good little lens imho, one that should be in every Canon users camera bag. Whether or not it's useful for astro imaging is another story.
Dave
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