I am imaging right now and I noticed something odd. Before starting my sequence, I did an autofocus and got an HFR of 0.89, which I figured was quite good so I went with it. I'm imaging in H-alpha and I use 25s exposures for autofocus, but 300 second exposures for my actual images. When my first, 300 second image came up the HFR was 2.01. Seems really high. Could this just be rapid focus change due to temperature change, since it's still early in the night? The temperature gauge on my focuser says I focused at 20.50 C and it's now 20.00 C. For what it's worth, seeing is above average tonight.
Edited by dan_hm, 12 July 2019 - 09:35 PM.