Hi-
Here are two views of my autofocus settings. For an SCT the step size will depend on how the focus motor is set up and how it is geared to drive the focuser knob - so it could be anything. In my case 500 steps is about 1 turn of the knob - so it is about 0.72 degrees per step. I have my autofocus step size set to 5 steps - or about 3.5 degrees - and I take 9 data points. My backlash is 500 steps or a full turn of the knob.
So in a focus run it turns the knob a full 360 degrees clockwise to remove backlash - and then it comes back pushing up on the mirror against gravity. Then it takes the full focus curve in 9x5 steps, which corresponds to only about 32 degrees turning of the focuser knob. The final focus accuracy is about +/- 2 steps or +/- 1.5 degrees roughly - and it is very repeatable.
Here are some pics of my settings:
Frank
