I have been using ASTAP to fine tune backspacing and tilt. You feed it a series of images at different focus positions moving all in one direction to avoid any backlash. It then determines HFR in different regions of the sensor (3x3 grid) and you find the minimum for each region to identify needed adjustments. At the moment I manually set new focus position then capture image, change focus position, capture another image etc. The automatic focus routine isn’t suited because it varies step size and goes back and forth, also doesn’t save the images for later analysis. Is there anyway to automate this in ekos, scan a variable, save images along the way?