Quote:
Originally Posted by DavidTrap
What distance do you use that at Marc??
Ta
DT
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With my 8" newt at F/12 (barlowx3) approx. 8m.
With the C11 you need to be outdoors. At least 26m.
You can use this close up for a defocused field and square your camera but if you want to work out precise collimation or optical aberrations you still need the final star test at infinity.
This will get you very close though. Board is 140x150mm.