TallFurryMan wrote: I'd like to know exactly what you all mean with "frame HFR". Normally, we would associate HFR with a single star sample. In the Focus module, we are using the average HFR of the frame to iteratively improve the focus quality of the optical path for the arbitrary sky patch sampled in the frame, with stars filtered based on an arbitrary annulus. This "average HFR" is only really valid for the duration of this procedure. What would you like to do with that value?