Celestron SCT Back Focus Study at Native and Reduced Focal Lengths

Описание к видео Celestron SCT Back Focus Study at Native and Reduced Focal Lengths

Still chasing stretched stars with my Celestron 0.63x focal reducer/corrector. Celestron says it requires 105 mm of back focus, but I'm seeing better results with 85 mm and still need to reduce the back focus. Geez.
According to my testing:
I need 154 mm back focus for my non-EdgeHD C9.25 to get the theoretical focal length of 2350 mm, instead of Celestron's back focus of 139 mm
and
I need 77 mm back focus with the 0.63x reducer/corrector to get the theoretical focal length of 1480 mm, instead of Celestron's back focus of 105 mm

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