I pulled out my C5 tonight to test my DIY focusing motor, seeing very bad at 3/10, transparency 6/10.
First up is a prime focus shot, taken at 1159 UT.
Next two are taken with a 3x barlows, taken at 1203 and 1208 UT respectively, 70% resized to hide some of the bad seeing.
Collimation could be better, since I didn't even tweak it before imaging.
The focuser is fine enough and it helps a lot at high image scale with my shaky Nexstar mount.