Quote:
Originally Posted by casstony
After reading again Allan, the maximum separation he used was 120mm, giving 0.6x reduction of f/8 = f4.8.
110mm total separation on an f/8 scope would give f/5.1 (195/305 x 8).
For imaging you should be able to use a greater separation on a SCT due to the slower native f ratio.
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Sorry you're correct As I was working on my SCT f ratio, for the f8 of the GSO RC then your distances are correct.