Hi Joe, Chuck here. If you can set up the telescope in front of a test-flat, you can test the telescope optical system as a whole using autocollimation & a Ronchi screen. This would make it easy to rotate the corrector with respect to the primary mirror, and easily see with your own eye if the figure suffered. Ideally the flat should be large enough to test the entire scope at once (full-aperture) but a smaller one will work in a pinch. IIRC, getting the corrector square is more important than a rotational alignment. Did you check for a pencil mark, or engraved fiducial of some kind on the corrector? C. --- Joe Bauman <bau@desnews.com> wrote:
Very interesting and informative, Patrick. What I'm wondering is, when you put the corrector plate back on, does it have to be aligned any particular way to the mirror? That is, is there a 12 o'clock that has to line up with an equivalent 12 o'clock on the mirror? Or can you put it on in any orientation?
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