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What I'm trying to do is to assess the focal length and field curvature of my RC10.
I know you really don't want to change the distance between the primary and secondary mirrors on an RC scope, so I want to check that it's precisely 2000mm.
But then I wonder what their manufacturing tolerance is. do they make their mirrors accurate to the mm in terms of focal length, or is there some variability?
I figure measuring the plate-solved focal length and testing against field flatness would enable me to zero in on the correct setup for my scope from an optical standpoint, rather than a 'well that's what the spec sheet says' standpoint because products can vary from their specs, as we know.
Cheers
Markus
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