Thanks Peter,

That's useful information. I should note that it's EKOS that pushes the focus to show donuts - I focus to a good level (just a smidge focus in from ideal focus) before I autofocus and even reducing the step size to between 10 and 20 steps for the iOption stepper motor, with a multiplier of 1 or 2, EKOS stills steps away from focus sufficiently to produce donuts on my RC. I'll try the Sep setting when we next have a clear night.

Many thanks

Mark

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