Focus ramping

Discussion in 'General' started by Jim Fakatselis, Jun 23, 2020.

  1. Jim Fakatselis

    Jim Fakatselis Cyanogen Customer

    Joined:
    Oct 10, 2014
    Messages:
    15
    Location:
    Huntington, NY
    I am imaging with a QSI683WS8 and a Starlight Instruments focuser with the Starlight stepper motor on an AP130mm refractor Using MaximDL. If I try to immediately refocus, my focus setting continues to drift up or down monotonically.
    if I repeat focus immediately over and over I get settings like this:
    15020, 15101, 15140, 15213 as an example.

    Reported temp is within 1 deg, measurements are made about 3-4 min apart. Little temp effect should be present.

    Any ideas on what I should look for?

    jim
     
  2. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    6,860
    You should ask Starlight Instruments about this. All MaxIm DL can do is switch on/off the temperature tracking. The focuser's electronics control that.
     

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