Quote:
Originally Posted by codemonkey
I believe the flattener is M66 on the scope side and M62 on the camera side. I need it to sit between a Celestron OAG, and an Orion Nautilus EFW, and I understand spacing of flatteners to be critical (never needed one before, so I don't know how critical).
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Some are not too critical, I believe that straight flatteners are more forgiving than a flattener & reducer. My last setup was maybe 1.5mm off and it was noticeable.