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Originally Posted by cristian abarca
Thanks ken I'll take you up on that when I'm ready.
Regards Cristian
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Christian, There's another slick way to Null test a Cass secondary by moving the light source much closer than infinity and increasing the spacing between the secondary and primary during the test. This can be a good way of fine tuning th ewhole scope as the primary mirror is in the light path too. Not too hard to calculate with raytrace software.
Mark