8" F4 newt and QHY10 help please
Hi everyone
I have a new gso F4 8" cf newt and qhy10 osc. Using a mppc spaced at 56mm which seems to give me the least coma. I'm still getting slight vignetting at the corners and I suspect my ccd needs to be tilted slightly.
What's the best way to figure out tilting? Is it a matter of taking flat frames and adjusting the collar? A sort of trail and error procedure?
Lastly would moving the mirror rearwards reduce vignetting? Or would that not make a difference because the focuser would have to move inwards the same amount to reach focus?
Any help would be great
Thanks jas
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