Thread: Making a Busack-Riccardi-Honders Astrograph
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  #69  
Old 11-08-2017, 09:45 AM
Stefan Buda
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Stefan Buda is offline 		 
Join Date: Jul 2013
Location: Melbourne, VIC
Posts: 832
Pat,

At this stage I would prefer to have only the two small lenses coated and they are only 50.8 diameter.
I would wait with the three large surfaces until I have the complete OTA tested under the stars.

Stefan
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