Dust or others ...

Discussion in 'STX and STXL Series Cameras' started by Martin Dufour, Oct 5, 2016.

  1. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    Hi Doug,

    Any idea ? Can't be dust because l never remove the Camera since the begining

    ccd.jpg
     
  2. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    file uploaded: FLAT-0001L02B1.fit
     
  3. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    9,932
    Recharge desiccant?
     
  4. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    Here a light ...

    If a change de desiccant, is the chip will returb back to clean ?

    How long is a desiccant life ?
     

    Attached Files:

  5. Tim

    Tim Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    1,841
    It looks like the CCD may have frost. What temperature is the camera being cooled to in this image?

    Has the desiccant plug been removed at all?

    Desiccant should be effective for many years, but it can be recharged by baking in an oven at 375ºF for 4 hours. Once plugged back into the camera (don't forget the o-ring), it may take several hours to overnight to remove any excess moisture from the chamber.
     
  6. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    Hi Tim,

    I always cooled to -30. it is good ?
    I have never remove the desiccant

    I just order a new desiccant, but according to your post, i will put the old one into the oven ...

    is after 2-3 hour, all donuts will desappear ?

    Thanks

    Martin
     
  7. William B

    William B Cyanogen Customer

    Joined:
    Jan 8, 2015
    Messages:
    548
    Location:
    Christchurch, Dorset UK
    My experience with a different make of camera is that at least 24 to 48 hrs is needed for the CCD chamber to become dry again after reactivating the desiccant.

    I take out and reactivate my desiccant plug in the oven once per year.

    William.
     
  8. Tim

    Tim Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    1,841
    Yes, that is ok.

    when cooled, do you see any frost forming on the sensor?

    Baking the desiccant will recharge it. Install it back into the camera, and after ~24 hours, it should remove the majority of any moisture inside the CCD chamber. I am only guessing, but it looks like possible frost on the sensor.
     
  9. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    Hi,

    I just open the Cam to remove the desiccant, it is actualy in the oven.

    This is a picture of the ccd chamber ...

    we can see the little bad thing on the glass ...

    Is the new dessicant will clean it ?
     

    Attached Files:

  10. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    9,932
    Yeah it will do. Next time try to refresh the desiccant before it gets that bad.
     
  11. William B

    William B Cyanogen Customer

    Joined:
    Jan 8, 2015
    Messages:
    548
    Location:
    Christchurch, Dorset UK
    Doug.

    Zooming in on Martins image those spots look more like condensate evaporation deposits on the outside of the CCD chamber window as they follow a linear path across the image and don't follow the topology of the CCD chip. do you think they could be on the outside surface of the chamber window or inside?
    If outside the chamber they should wipe clear with a suitable lens cleaner but if inside the window the camera might need servicing, what do you think?

    Really difficult to tell from a single angle picture

    William.
     
  12. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    9,932
    It really is hard to remote-diagnose these things, so a step-by-step approach is best. He should try recharging the desiccant first.

    That has a good chance of working, but if it doesn't then there are a few more steps we can do. I always try to avoid having the customers send in a camera, which might not actually need it.
     
    William B likes this.
  13. Martin Dufour

    Martin Dufour Standard User

    Joined:
    Apr 22, 2016
    Messages:
    52
    It is outside of the ccd chamber and it's removed ...
    I use a eyeglass cleaner

    thank you SBIG's team !
     
    William B likes this.
  14. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    9,932
    Glad it's sorted!
     

Share This Page