I have reviewed several months of wide field astrophotography to determine the
widest satisfactory aperture for my Olympus OM camera lenses. What I care about
most are coma, spherical, and chromatic aberrations. Vignetting is less of a
problem, because it can be mitigated in post-processing.
Here's a summary:
Lens f-stop stop-down
Zuiko 8/2.8 8 3 stops
Sigma 16/2.8 8 3 stops
Zuiko 28/2 4 2 stops
Zuiko 50/1.8 2.8 2 stops
Zuiko 90/2 2.8 1 stop
Zuiko 135/2.8 4 1 stop
Zuiko 250/2 2 0 stops
Matt BenDaniel
http://people.ne.mediaone.net/mbendaniel/gallery/astro/wide.html
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