Quote:
Originally Posted by morls
I've attached a grab from an article liked to in another thread here on IIS (can't remember which just now, will track it down).
I'm thinking of making a simple Y-shaped aperture mask and testing on a star (if and when the skies clear here...)
Would this be enough to identify over-tightened corrector screws? And collimation issues?
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If it really is that simple, you could pretty much make one with gaffer tape!
Markus