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Well thanks for the feedback. looks like i have some work ahead of me to weed out some things to get longer exposures.
AFter some more tinkering last night was able to approach 10 min exposure with short focal length. but once I start approaching 100-200mm FL things go wobbly after a min or so.
How can you determine if these errors are from bad polar alignment or an issue with my tracking mechanism??
currently its driven by a stepper motor with a 27:1 ratio gearbox which then feeds a 5:1 belt drive. After microstepping (1/16th step) is accounted for I have over 400,000 steps of resolution in one rotation of my RA axis. So i'm pretty certain my drive speed is good. But I haven't devised an accurate way to test it other than in the field use..
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