Focus point for a 10" F/8 GSO CF TrusS RC

[TrevorW]

Anyone able to help here need to know back focus distance for visual observing using this scope, either using a 20MM or 35MM 2" eyepiece the focuser is a Moonlite with about 30mm movement :thanx:

[Boozlefoot]

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/product_info.php/language/en/info/p10815_TS-Optics-10--f-8-RC-Teleskop-mit-Carbon-Truss-Tubus-and-Focuser-Tilting.htm

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

[TrevorW]

Thanks