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Old 03-11-2022, 02:57 PM
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Boozlefoot
SQM 21.98 mag./arc sec2

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Join Date: Nov 2016
Location: As far from Suburbia as practical
Posts: 452
They say 131mm from 2" plug in sleeve, or 226mm from (117mm x 1) thread on tube, nominal backfocus being 210mm.

https://www.teleskop-express.de/shop...er-Tilting.htm

I struggled for ages getting backfocus on an 8" for vis.
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