I am using darks, and have the min star size at 2 pixels.
Robin, I'll send more images, but won't have good weather again for at least a week.
It's the time of year we get rain in the desert.
Slow response
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- Posts: 39
- Joined: Sun Jun 11, 2017 5:54 am
- Location: Scottsdale Arizona
Re: Slow response
My winning combination is:
1. 400mm scope with 0.5x focal reducer yields 1.7 degrees on the diagonal of my ASI120MC
2. 2sec exposure 100 gain with dark frame subtraction
3. Minimum star width: 4 pixels
4. Wait until beginning of astronomical twilight (Sun is 12 deg below horizon)
Within 20 minutes I can get my polar alignment error below 20 arc-sec. (It could be faster if my mount had fine adjustment knobs in azimuth).
1. 400mm scope with 0.5x focal reducer yields 1.7 degrees on the diagonal of my ASI120MC
2. 2sec exposure 100 gain with dark frame subtraction
3. Minimum star width: 4 pixels
4. Wait until beginning of astronomical twilight (Sun is 12 deg below horizon)
Within 20 minutes I can get my polar alignment error below 20 arc-sec. (It could be faster if my mount had fine adjustment knobs in azimuth).