|
Image shift between shots is usually the result of drift from differential movement with a side by side setup or mirror flop/shift.
Out of round stars can be because of backlash and mount integrity, it can also be because of over aggressive settings in phd, I tend to under guide slightly and catch up rather than overshoot, so I have my guiding at 1 sec intervals and use 10% aggressiveness.
This may not be the causes, but worth considering.
Really poor polar alignment can also cause drift in a side by side setup
|