I've guided with a 9x50 finder scope, worked really well... Using PHD guiding, I just had to increase the calibration step size... I cant remember the standard settings but I remember the number I used being well over 3x the default step size. I used this twice to guide my C11 @ F/6.3 and achieved good results.. Stopped using it in favor of an off axis guider.
Cheers.
Alex.
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