Learning how to image Deep Sky again

After many months without Deep-Sky, and with Mars getting smaller and smaller, it’s time to pick up DS imaging again. That did not go smooth! Many issues, and also not that happy with the intermediate result. I should check the sensor distance against the reducer!

Check: stars are bloated due to a lack of UV/IR blocker. An in addition the sensor distance was off by 10,5mm which explain sthe stretched stars in the corners.

M31, 5DEC2020 TS76EDPH F4.5 & ASI183MM Luminance no filters (also not a UV)