Hi John, I did some tests back in July where I captured some images at various step positions from way out of focus to near focus. I didn't use auto focus, just used capture changing the step position between frames.
Below are screen grabs from Fits viewer of about 1/3 of the frame. The HFR values are those as given in the fits viewer and seem to me much what I would expect so good results I thought at the time. I plan to do repeat this test to ensure focuser and optics are good and then on same night run auto focus tests to see how they perform. I have messaged you to see how I can send you these images, 18 in number, about 140 mb zipped