Quote:
Originally Posted by TrevorW
David hers the thing how do I check that ??
I focus on a star using a mask etc, set up QHy268c 10" GSO RC with Moonlite focuser
my image train is focuser extension tube filter situated around 50mm from camera sensor in adapter,
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Well just from my own experience with similar stars using my scts I’ve made use of small spacer rings from 0.1-2mm. By adding and subtracting I got to a point where they stars were reasonable in 2 or 3 corners. Then I tried to tackle tilt to resolve the final corner, and then final tweak in backspacing if necessary.
It’s amazing how much of a difference 0.1mm can make!!