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Old 11-05-2021, 09:11 PM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
Posts: 21,310
Quote:
Originally Posted by legswilly View Post
If the secondary mirror is larger then the refection of the primary, then there would not be a corner.
You still have a sharp angled obstruction in your circular scope aperture so that statement is incorrect. The reflection from the primary fitting within the secondary surface only means you have no vignetting.

I don't know if you can or how to grind square or rectangular surfaces flat. Someone else can chime in.
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