If astrophotography is your intent, you might be best off with the 50/2.0
macro, as I understand it has much better correction for the aberration
(spherical?) that causes coma with pinpoint light sources. This aberration
can be very noticeable with the 50/1.2 and the other 'normal' lenses. There
has been discussion of this on the list in the distant past, you might be
able to find it in the archives.
Maybe some of the real astrophotographers on this list can elaborate.
Chip Stratton
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