[APML] Opinions: Best 28mm Lens for Pentax or Olympus?

["Koebel, Alen" <Alen.Koebel@christiedigital.com>]

I am looking to buy a good, used 28mm lens (manual focus,
of course) for astrophotography, either for Pentax or 
Olympus cameras (preferably for the former). I have 
tested a Vivitar 28mm f/2.8 (on my OM-1) and found the 
stars in the corners and near the short edges of the 
frame too distorted for my taste, even with the lens 
stopped down to f/4. That should give you an idea of my 
expectations. Any recommendations? 

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