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Old 20-09-2016, 04:12 PM
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Slawomir (Suavi)
Amateur Photon Collector

Slawomir is offline
 
Join Date: Sep 2014
Location: Proserpine
Posts: 2,987
You shouldn't have any problems with finding suitable stars at f/5.6; my telescope with a reducer works exactly at the same f ratio and I never had any problems with finding a good star.

I think keeping the prism as close as possible to the optical axis is particularly important with SCTs and telescopes that cause star shapes to deteriorate quite signicantly further away from the optical axis.
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