What is the best way to calibrate PHD?
A. The technique that I use is to just pick a star that is not too bright but also not too dim. Calibrate PHD. Then set the imaging program to focus mode and let it cycle at 60, 90 or 120 seconds. Make adjustments to PHD until you get pinpoint stars. Spend a night adjusting the settings. If your goal is for long exposure shots. Then calibrate for 300 seconds.Q. Do I have to recalibrate after each adjustment.A. No. All calibration does is figure out how far the star moves and in what direction. The only parameter used during calibration is the step size and, within reason, that won’t affect the accuracy of the calibration at all. Feel free to change any parameter without recalibrating.Q. When near the pole PHD doesn’t seem to guide or calibrate well.A. When you guide near the pole there is less noticeable drift. and guiding becomes a lot easier. Calibration, particularly in Dec, becomes tougher. Think of it this way.
