Thread: Secondary mirrors - source/quality?
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Old 05-06-2018, 07:10 AM
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AstroJunk (Jonathan)
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AstroJunk is offline 		 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,945
Interesting. I have a 3.5" in my 20" f5 with a beautifully illuminated field visually and only minor vignetting with a full frame dslr.

Antares is the way to go. 1/15th is fine. Go for the 1/30th anyway, I would
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