Thomas Mason replied to the topic 'Focus backlash issue' in the forum. 1 year ago

A few observations:

I think the overscan/backlash separation is the right move. Allow separate determination of whether the driver or focus routine manages backlash. In my case I have a Nitecrawler which works very well and doesn’t seem to care - it works fine as is with the linear 1 pass routine even if if doubles up somehow. My second rig has an Esatto and the driver backlash seems not to work well, it introduces randomness having it enabled. Linear 1 pass doesn’t even run unless the backlash box is unclicked - this does leave some residual backlash in the system. I think the overscan option in this case might help.

Regarding the ASTAP tilt/backfocus - this is a very quantitative approach to dialing in best possible image. Having an option in the focus routine where you could automatically scan through the focus position unidirectionally while saving the images would be handy. At present you have to monitor and step the focus position then take a 30 second image, step and image etc until you have all the images to load into ASTAP. Specifying a starting point, step size, and number of steps and walking away for 15 minutes or so would be a nice convenience.

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