Refractor Eyepiece End by MacPurity

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$Refractor Eyepiece End$
16-Apr-2016	John Robbins

Business end of the 40 inch refrator at Yerkes Observatory, Williams Bay, Wisconsin.

Nikon D810 ,Sigma 15-30mm f/3.5-4.5 EX DG ASP
1/125s f/4.2 at 26.0mm iso5000 full exif

other sizes: small medium large original auto

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