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Old 11-05-2021, 05:19 PM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
Posts: 21,250
Originally Posted by legswilly View Post
Could I use a round or a rectangular or square mirror for the secondary mirror in a reflector? If not, why not?

Thank you for replying
Any corner in the light path will create diffraction patterns and light scattering. I would not recommend it if your mirror doesn't fit in the shadow of the round holder.
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