In the past, I've generally run an autofocus every 30 minutes (I don't have a temperature gauge on my rig). But I've recently switched to NINA and have used the autofocus on HFR change (default of 5% over 10 images). But no autofocus run was triggered during the entire night. The temperature change during the night was only 5.5 C (10 F), and I was using a Redcat 51 with an image scale of 3.1 arcsec/pixel. The images have come out fine, and I'm assuming there just wasn't a need for any autofocus runs.
Am I correct in assuming that given a more severe change in temperature or a different scope/resolution, an autofocus run might have been triggered?
Also, am I correct in believing that HFR variance is a better metric for triggering an autofocus run that temperature change alone, since HFR change is a direct measure of the need for refocusing?
Am I correct in assuming that given a more severe change in temperature or a different scope/resolution, an autofocus run might have been triggered?
Also, am I correct in believing that HFR variance is a better metric for triggering an autofocus run that temperature change alone, since HFR change is a direct measure of the need for refocusing?
