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Thanks Glenn, that's good advice. I do want to get to the point of full automation which is one reason why I chose to go with a fan at the rear rather than a lightbulb as I could in theory leave the fan running all the time as it would help with cool down / boundary layer as well as keeping the primary dew free in the mornings.
Ok so I finally got a clear night tonight so I was able to do another quick test. I fully intended to do what all the smart people above suggested, but then I thought I'd try something quickly and then I got fixated on that instead.
I theorised that if the astigmatism was caused by misalignment of the CC / collimation, it would stay in the same orientation relative to the image if I rotated the camera. If it were the mirrors it would rotate with respect to the image.
I have a Moonlite Litecrawler with built-in motorised rotator so I can rotate very accurately while keeping everything else the same and I like tests where I can easily and accurately change just one variable.
I performed the rotation test close to zenith and closer to the horizon. The results were the same. When I rotated the camera, the astigmatism changed it's orientation with respect to the image, which makes me think it is one of my mirrors. Am I on the right track here?
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