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Old 28-01-2021, 07:51 PM
astro744
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astro744 is offline
 
Join Date: Apr 2007
Posts: 1,244
Some info from Tele Vue on APO design.

https://televue.com/televueopticstal.../#.YBJ4t8rZWhA

I think build quality and testing and buying from a reputable manufacturer should be considered in the decision process.
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