Quote:
Originally Posted by The_bluester
Backlash compensation should not result in the HFR at the ends of an autofocus run being increased. It is to remove mechanical backlash in the focus system itself. Generally with any scope moving a drawtube to focus, all focus moves should be lifting the load. If you need to move focus inward by 50 steps it moves inward by 50 steps, if you need to move outward by 50 steps and had (As an example) 200 steps of backlash compensation, it will move outward by 250 steps then come back in by 200, so the last move was against gravity. The end result is still only a move of 50 steps.
If you have backlash compensation set up right, if you trigger an outward focuser move you should see the focuser move out, then in again. An inwards move should be in only.
The Sesto probably has a backlash compensation setup in the driver and it sounds like Nina does too now, only use one of them, not both.
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I am not using the Sesto Senso device on my main scope. I am using the Pegasus Focus Cube 2. The point I am trying to make is that I rarely get anything other than a saw tooth result with my autofocus routine. During any movement of the autofocuser routine (with a setting of 550 step Backlash OUT as I measured about 440 step backlash) setting, I see the overshoot working. I recall seeing some discussion about why a saw tooth result was seen but I can't recall why it was that way. It is rather annoying as sometimes the autofocus routine seems to go nowhere and it will give up with the result out of focus.