Quote:
Originally Posted by Astroman
I found the same, although stopping it down does decrease the effects of it, it's still not a very good lens for Astro work...
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That depends on what you want to do.
It is perfectly adequate for serious work, like novae and variables...
It is interesting to see the comparison of various 50mm Canon lenses.. see the link below.
http://www.astrosurf.com/~buil/50mm/test.htm
None of them is perfect at full aperture, but at f4-~5.6 are better..
F1.2 at f5.6 is the best of a lot. The same philosophy applies to other brands as well.