Thread: Making a 6 inch f2.8 dob
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Old 19-09-2018, 03:36 PM
bratislav (Bratislav)
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Join Date: Aug 2006
Location: Europe
Posts: 235
They use a lot more expensive glass, and a lot more of it. Paracorr2 has 5 lenses, most likely some ED as well as Lanthanum.
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