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683RE: [ccd-newastro] Ice Crystals

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  • Ron Wodaski
    Nov 1, 2000
      I did not want to open that part of the camera, as I did not want to take a
      risk of contaminating the chip. You need to expose the chip to the air in
      order to see what's what.

      The best test would be recharge the desiccant, and then see if it stays dry.
      If it does, then you just needed to recharge. If it quickly frosts up again,
      you have an air leak into that chamber, and the camera needs service.

      Ron Wodaski
      The New Astronomy Book Site - http://www.newastro.com



      -----Original Message-----
      From: Joe Marietta [mailto:jmarietta@...]
      Sent: Wednesday, November 01, 2000 2:27 PM
      To: ccd-newastro@egroups.com
      Subject: RE: [ccd-newastro] Ice Crystals


      Thanks again Ron,
      Will I be able to tell if the O-ring is crimped. I have never opened that
      camber before.
      Joe


      *********** REPLY SEPARATOR ***********

      On 11/1/00 at 8:19 AM Ron Wodaski wrote:

      >That can happen. Once you condense out the moisture, it seems to stay away
      >for a while. Not sure why that would be, but that was my experience when I
      >had that crimped o-ring.
      >
      >Ron Wodaski
      >The New Astronomy Book Site - http://www.newastro.com
      >
      >
      >
      >-----Original Message-----
      >From: Joe Marietta [mailto:jmarietta@...]
      >Sent: Wednesday, November 01, 2000 12:45 AM
      >To: ccd-newastro@egroups.com
      >Subject: RE: [ccd-newastro] Ice Crystals
      >
      >
      >Thanks Ron,
      >I had a hunch those were crystals. Funny thing, after I raised the camera
      to
      >ambient temp, then waited for the frost and crystals to leave, it worked
      >great all night for the next 8 hrs.
      >
      >Joe
      >
      >
      >*********** REPLY SEPARATOR ***********
      >
      >On 11/1/00 at 12:09 AM Ron Wodaski wrote:
      >
      >>Those are almost certainly icing. There is a desiccant inside the camera
      >>that is used to dry the chamber where the chip is located. There is a
      large
      >>brass plug, removable from outside the camera, that contains the
      desiccant.
      >>You can remove the brass plug, bake it in an oven for several hours, cool
      >>it, and then replace it in the camera. Your camera should have come with a
      >>black plug, no desiccant, but you can put it in the camera to keep dust
      out
      >>of the chip chamber.
      >>
      >>You can get the specific details of the desiccant recharging process in
      the
      >>docs that came with your camera, or contact SBIG for any assistance you
      >>require.
      >>
      >>Ron Wodaski
      >>The New Astronomy Book Site - http://www.newastro.com
      >>
      >>
      >>
      >>-----Original Message-----
      >>From: Joe Marietta [mailto:jmarietta@...]
      >>Sent: Tuesday, October 31, 2000 7:43 PM
      >>To: ccd-newastro@egroups.com
      >>Subject: [ccd-newastro] Ice Crysals
      >>
      >>
      >>Hi Folks,
      >>I uploaded a file called "holes" for help. I have a new ST8E NABG
      >>that I have had
      >>for about 9 months, but am now just beginning to use it. Prior to
      >>use, it was stored in dry Pelican case.
      >>
      >>Now after a few nights of good service, I am now getting these holes
      >>in my images... are these or could they be ice crystals?
      >>
      >>Questions:
      >>
      >>1. Can a relatively new camera get these? Granted I have had the
      >>camera for 9 months, but it has be well stored and not exposed to the
      >>enviornment
      >>
      >>2. What do I do now?
      >>
      >>Thanks
      >>Joe
      >>
      >>
      >>
      >>
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      >>
      >>
      >>
      >>
      >>
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      >
      >
      >Joseph Marietta
      >jmarietta@...
      >http://www.astrodoc.com
      >
      >
      >
      >
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      >
      >
      >
      >
      >
      >
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      Joseph Marietta
      jmarietta@...
      http://www.astrodoc.com




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