Resolved Artifacts on sensor

Discussion in 'STF Series' started by Steven Greco, Sep 28, 2019.

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  1. Steven Greco

    Steven Greco Cyanogen Customer

    Joined:
    Sep 9, 2019
    Messages:
    15
    Hi.

    I've been putting my STF-8300 through its paces indoors, getting used to how everything works and I'm seeing artifacts that appear to be in the camera. Attached is an indoor shot at a wall 20 feet away so it's obviously not focused. The artifacts don't seem to change when I rack the focuser from one extreme to the other. The location and appearance of the circles also don't change when I rotate the camera on the telescope, so it's not in the telescope optics. What am I seeing here?

    Full disclosure: this is the first CCD camera I've owned, so my inexperience may be showing. :)

    Thanks.

    Steve
     

    Attached Files:

  2. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    6,193
    Those are dust spots. Given their size they are probably on the front window of the camera, or possibly on a filter or focal reducer in front of the camera, if you are using one.

    There are a couple of things you can do:
    1. Get a can of compressed air and blow them off!
    2. Use Flat-Field calibration to remove them. That would also help with your vignetting.
     
  3. Steven Greco

    Steven Greco Cyanogen Customer

    Joined:
    Sep 9, 2019
    Messages:
    15
    Dust! Of course. I'll get a can and do that.

    A few puffs of air and problem solved!

    Thanks, Doug!

    Steve
     

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    Last edited: Sep 28, 2019

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