STXL 11002 blooming

Discussion in 'STX and STXL Series Cameras' started by Robert Mueller, Feb 4, 2016.

  1. Robert Mueller

    Robert Mueller Standard User

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    I was wondering if anyone is seeing blooming with their STXL 11002 camera? I know there was a fix reported in the past for 11000 camera where there was an "adjustment" to the ABG. I called Bill at SBIG and he checked with engineering and there is no adjustment for this camera.

    I'm using a fast scope (300mm f3.8) which leads to faster star saturation but I get blooming long before I have enough signal on my deep sky object for final images.

    I see very minor blooming beginning at 25 seconds while binned 1x1. It's acceptable but longer exposures quickly become unacceptable for producing "pretty pictures". I tried to upload a cropped image but I get and error. Here is a dropBox link to a cropped 1x1 luminance image at 200 seconds exposure.

    https://www.dropbox.com/s/21rhkshbwkix8hw/NGC281_L1x1-25W_200sCropBlooming.fit?dl=0

    Robert Mueller
     
  2. Doug

    Doug Staff Member

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    I think using the term "ABG" confused people. It's the substrate voltage that needs to be tweaked.
     
  3. Robert Mueller

    Robert Mueller Standard User

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    Sorry for using the wrong terminology. According to Bill no tweak is available on this model (self guiding). I guess what I'm trying to find out is this normal and expected behavior for this camera.
    Robert
     
  4. Doug

    Doug Staff Member

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    I think Bill misunderstood. There is a substrate adjustment.
     
  5. Robert Mueller

    Robert Mueller Standard User

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    Who can perform the substrate adjustment?
    Thanks,
    Robert
     
  6. Robert Mueller

    Robert Mueller Standard User

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    Who can perform the substrate adjustment?
    Thanks,
    Robert
     
  7. Bill

    Bill SBIG Service and Repairs Staff Member

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    Robert,

    Can you confirm whether or not your camera has the built in internal guiding ccd?

    -Bill
     
  8. Robert Mueller

    Robert Mueller Standard User

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    Bill,
    Yes it has the internal guider.
    Robert
     
  9. Doug

    Doug Staff Member

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    What is the exact model number and serial number of your camera?
     
  10. Robert Mueller

    Robert Mueller Standard User

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    Hi Doug,
    My camera is: STXL-11002M SN: X14110364
    My Filterwheel is: FW8G-STXL

    Thanks,
    Robert
     
  11. Bill

    Bill SBIG Service and Repairs Staff Member

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    Robert,

    There is some confusion because there is no recollection of the STXL-11002 being made with the built in, internal guider. Can you take a picture with the shutter of the camera open, looking down into the ccd chamber and either post it here or send it to me at bill@sbig.com please?

    Thanks,

    Bill
     
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  12. Robert Mueller

    Robert Mueller Standard User

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    Bill,
    I'm imaging at the moment. This camera has the guide prism in the filterwheel.

    If you still need a picture I can do that first thing tomorrow.

    Thanks,
    Robert
     
  13. Doug

    Doug Staff Member

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    I've looked up your serial number in our database and confirmed that your camera is NOT self-guiding. That fits with your report that the filter wheel is self-guiding.
     
  14. Robert Mueller

    Robert Mueller Standard User

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    Correct.... So is this camera model allow adjustments for blooming?
    Thanks,
    Robert
     
  15. Doug

    Doug Staff Member

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    Yes.
     
  16. Bill

    Bill SBIG Service and Repairs Staff Member

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    Whew! Glad we got that sorted out. The guider in your FW is considered "external" Robert.
     
  17. Robert Mueller

    Robert Mueller Standard User

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    Yes sorry for the confusion with my incorrect terminology.

    Bill is this something that you can service?

    Thanks,
    Robert
     
  18. Bill

    Bill SBIG Service and Repairs Staff Member

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    Yes, but we're in discussion offline about whether or not it is Customer Serviceable.
     
  19. Robert Mueller

    Robert Mueller Standard User

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    Bill,
    Any updates to this issue?
    Thanks,
    Robert
     
  20. Bill

    Bill SBIG Service and Repairs Staff Member

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    Yes, give me a call tomorrow, 805 308-6979.

    -Bill
     

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