Can you clarify for me what tools in the focus module best cope with diffraction annuli as the focus is automatically moved in and out of optimum HRF for a scope with central obscuration - in my case an 8” RC?
Reading the evolving discussion between yourself, Peter and Nigel, and looking at the online documentation, I’m not entirely sure whether there is a mechanism in each algorithm to determine the outer diameter of an annulus (donut)? What I am finding with an obviously course focusing iOptron electronic focuser is that EKOS passes a point where it stops measuring the enclosed energy of the donut and limits itself to part of the donut (or indeed determines if can no longer detect a star).
I’m really just looking for guidance on what are the critical variables per implemented algorithm that are most appropriate for obscured catadioptrics?