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Those are way cool shots Marc. Wow, you got the Nth America neb and the Veil. The Orion shot turned out great too.
I am not so sure about a faster aperture 50mm frmo Pentax. I have a 55mm 6x7 lens and it needs to be stopped down so any gain from faster F ratio you probably can't use anyway.
A Nikon or Canon 50mm F1.8 may be the go though. I have used a Nikon 50mm F1.8 and it seemed sharp wide open. I had the Canon equivalent and I tested both against each other and they seem identical in terrestial shots.
Greg.
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