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From memory I found a little residual coma in my C925 once I was at my happiest spacing wise with the combination of correction, reduction and vignetting. I was substantially under the 105mm from memory. I am about to set that scope up again so I will have to measure and record it properly this time.
There was a little residual coma (A vanilla C925 really was not intended to be an astrograph) but I actually found it handy. If the coma was pointed into the corners (As in, directly away from the center of the image) then the collimation was bang on. I was able to dial it in without resorting to CCD inspector or similar programs.
Last edited by The_bluester; 14-07-2020 at 01:44 PM.
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