Artifact occuring only in flatfield images from STXL-11002

Discussion in 'STX and STXL' started by Chris Abissi, Apr 14, 2015.

  1. Chris Abissi

    Chris Abissi Cyanogen Customer

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    I am observing the same artifact on all the flat field images taken with my STXL-11002 regardless of filter. I am using a digital flat fielder light panel as the source of illumination. I see no such artifact in the light frames and as expected it introduces itself into the images during calibration.

    A JPEG version of the flat with the artifact on lower right side and also on left to a lesser extent.

    Chris A.
     

    Attached Files:

  2. Chris Abissi

    Chris Abissi Cyanogen Customer

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    Has anyone seen such an artifact before? What are the possible sources?

    Chris
     
  3. Bill

    Bill SBIG Service and Repairs Staff Member

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    Chris,

    Can you send the image, in fits format, to me at bill@sbig.com? It looks like what is talked about in the Application Note "Adjusting the ABG level of the STL-11000M Camera". You can read it in the Application Notes Archive under the Support tab on the SBIG website. I realize you have the STXL but that's what it looks like.

    -Bill
     
  4. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    Hi,

    I just read this and can confirm these artifacts in Flat images too with my STXL 11002 camera. Is there a solution now? Does it has something to do with the ABG level.
    What I am wondering is that these artifacts are not constant in all images. Some have it and others not, taken with the same filter and time. They are also not always in the same position. Always on right or left side, but not in the center part. I also have to say that in short light images they are also viewable.

    Konstantin
     
  5. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    Hi,

    I am still waiting for a solution! My solution in the moment is that I take lots of Flats and through all with the artifacts away.
    But I would like to have a better solution! In the posts is written that it can be a problem with the ABG level. Is that true??

    Konstantin

    P.S.: I ask so late cause I used in the meantime my STXL 16200.
     
  6. Colin Haig

    Colin Haig Staff Member

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    Hello Konstantin,
    Bill is unavailable due to holidays.
    Can you provide us with a sample flat field, dark, and bias frame in FITS format so we can see what is going on?
    You may need to use dropbox if the files are large.
    Thank you,
    Colin
     
  7. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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  8. Colin Haig

    Colin Haig Staff Member

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    Konstantin, we also need a bias image.
     
  9. Colin Haig

    Colin Haig Staff Member

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    Konstantin, besides a bias image, the timestamp on these images is 2013, that's 6 years ago. Perhaps you need to reset the time on the computer.
     
  10. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    I have dropped the file in the same folder: Bias-004FH61.fit

    Konstantin
     
  11. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    If you want I can make new images in the Evening.
     
  12. Colin Haig

    Colin Haig Staff Member

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    The image you labelled as a Bias is a 4 second exposure, not a bias frame, and it's from 2011.

    For us to help, you need to do a current set of bias, dark, and flat images with your current setup.
    Also, I suggest you check for light leaks and reflections, and perhaps provide a photo of your equipment setup so we can see how everything is attached, if there is an AO, filter wheel, etc.
     
  13. Doug

    Doug Staff Member

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    Looking at those images, I think there's an instability in one of the camera's internal power supplies. Probably one that powers the CCD clocks.

    What is the serial number of your camera?
     
  14. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    I have shot new ones. Interesting was that only the one was with the artifacts!
    I have copied it in a new folder Flat_Dark_Bias together with a Dark and Bias.

    Konstantin
     
  15. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    Here is the serial Nr. X13020186.
    A Image of my setup I have also put in the Cloud Folder

    Konstantin
     
  16. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    Are there news?

    Konstantin
     
  17. Doug

    Doug Staff Member

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    I think it is best that it come in for service. Bill is on vacation this week though. Contact him at bill@sbig.com
     
  18. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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    Hi Doug,

    I live in Germany! Will Baader Planetarium be able to service?

    Konstantin
     
  19. Konstantin v. Poschinger

    Konstantin v. Poschinger Cyanogen Customer

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  20. Doug

    Doug Staff Member

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    @Bill Lynch is on vacation this week. He will be able to answer when he returns, but I don't think Baader can do this.
     

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