Re: Mach2 - Elongated stars
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I will check my mount serial number later as I just packed everything due to rain forecast.
My camera's orientation was 0/180 degree, so I assume top to bottom elongation would be DEC.
I dont have any picture of my setup, I just tore it down since it will be rainy this week. My setup is FSQ106+OAG+16803, image scale is 3.5".
I was imaging Rosetta Nebula, after it was just past meridian for 2-3 hours.
I used PHD2 drift for PA, it reported <5' PA error, I am waiting for polemaster adapter so I can confirm I get good PA next time.
DEC was out of balance because my setup was rear end heavy, if it was in balance position then I could not rotate my CCD in all directions. My guess is that the DEC balance was off by less than 1lb. In the next test, I can balance DEC to see if the issue still exists.
My suspicion is that if DEC balance is off, then DEC might creep under gravity, even PA is perfect. So you might see DEC continually drift then gets corrected by PHD2 periodically.