DiscoDuck
15-11-2016, 08:12 PM
The GSO RC8" scope comes with 50mm and 25mm extension rings -- i.e. the ones that screw directly on to the back of the primary I mean.
Does anyone know of anywhere that sells these in a slightly shorter size, e.g. 15mm or 20mm?
Reason I ask is I'm sizing up to purchase a new focuser (+ rotator) and backfocus is very tight for it with the smaller (25mm) ring in place - at least with the field flattener (AstroTech) and collimation ring I'm using. An extra 5mm or so even would help I think.
Thanks for any advice,
Paul
Does anyone know of anywhere that sells these in a slightly shorter size, e.g. 15mm or 20mm?
Reason I ask is I'm sizing up to purchase a new focuser (+ rotator) and backfocus is very tight for it with the smaller (25mm) ring in place - at least with the field flattener (AstroTech) and collimation ring I'm using. An extra 5mm or so even would help I think.
Thanks for any advice,
Paul