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Mount
All
I am kind of new to imaging and most of the time I can get decent images from my guided scope. A few weeks ago I could not get a decent image due to tracking errors (elongated stars, double stars). I use PHD to guide a ST80 on the main scope (9.25 SCT) on a ASGT. This problem got me to thinking (you can tell by the smoke coming from my ears).
1. How do you evaluate the quality of a mounts ability to track by itself and under guiding?
2. On a CG5 can we see the periodic error? Can we compensate for it.
3. What is a realistic maximum exposure time I should expect with quality star roundness (if that is even the right measure)?
Any thought are welcome!
Ed
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