dspender How do I tell the ASIAIR to multistar calibrate each time instead of accepting single star calibration?
If you mean ASIAIR's auto-guiding, do not tap on any star after starting looping. If you do that, ASIAIR will use single star guiding on the star nearest where you have tapped.
After tapping on looping, wait a second or two (and you should also see stars appearing), and go tap on the auto guide button.
Be sure your guide scope produces a flat field over the guide camera's frame. If you can't get a flat field, you will be better off with single star guiding, as long as your mount can tolerate a 2 to 3 second guide exposure.
Many people blindly follow the YouTube shills when they tout multi-star guiding. Single-star and multi-star guiding are just two methods to guide. With single-star guiding, you are depending on a longer guide exposure (2 to 3 seconds) to average out the centroid that jitters around due to atmospheric turbulence. With multi-star guiding, you are depending on the average of the centroids of multiple stars to average out the atmosperic turbulence. If your mount is good enough that it does not take more than 1 guide pulse per 2 or 3 seconds, single star guiding will be more trouble free (less dependent on a good flat field guide scope, more camera sensitivity to pick up dim stars, field rotation, etc).
Chen
