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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #260500

For Sale: 4" Secondary - Russian Quality *S O L D*

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This is 4” diagonal secondary mirror that came as part of an optical set with my 20” f/5, Russian made, Astrositall primary. It has never been touched or mounted. I used a 3.1 inch secondary instead.

Do not know specs on this secondary except that I expect that it is of VERY high quality since the interferrogram for the associated primary indicates 0.987 strehl ratio and is a real performer in my Obsession scope.

$70 shipped CONUS from AZ

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