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Brian - the problem was in the design - not quality control....the design was not adequately done to suppress internal reflections and the AR coating were inadequate. From memory when looking at the Moon the central 1/3 of the field was swamped with a ghost image...
Your response is wordy and positive but no reference to my criticism of these short focal length Long Perne . Any comments on ghost reflections?
I reiterate that the 5mm LP was useless for lunar observation - it went straight back.
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