AF has been working very well for me (well collimated 10" f3.9 reflector) but the AF curve is not symmetrical, though the parabolic shape is fine and consistent and the focus is accurate . The first HFR reading in an AF routine is typically above 5, while the last one tends to be much lower, like between 3 and 4. The number of steps is correct, meaning the first measurement is 100 steps above the focus value and the 9th measurement is 100 below it using 9 data points with a step size of 25. Just wondering what might cause this asymmetry, possibly optics issues?
↧