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Does this look like ice on the sensor ???


Skipper Billy

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I don't think so. Ice on a sensor shows as blobs which grow as the ice spreads. The second image looks as if it has not downloaded correctly. It may be a hardware issue, usb loose or just a blimp in the software. Were all your subsequent images ok.

Steve

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Quick update in case anyone has similar issues and comes across this thread.

Set up the camera indoors last night to see what happened when I took some darks. Perfect.

Buoyed up I set it up again in the observatory and ran some focus routines in Focusmax - perfect.

Tried a few trial long subs before the clouds rolled in - perfect.

The only think I changed was putting the camera in the airing cupboard for 48 hours and drying the desiccant tablet for an hour in the oven and then 24 hours on a hot radiator before re-installing in the camera.

So I dont know what the problem was but its cured (for now!!)

 

 

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On 08/02/2017 at 11:08, sloz1664 said:

I don't think so. Ice on a sensor shows as blobs which grow as the ice spreads. The second image looks as if it has not downloaded correctly. It may be a hardware issue, usb loose or just a blimp in the software. Were all your subsequent images ok.

Steve

I know you've said you've cured whatever was the problem. But since it got progressivly worse during the night, could it have been a dew problem on your optics?

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That doesn't look like ice on the sensor at all to me. I've had it happen a few times and it never has a straight edge like that. Ice on the focal reducer or sensor window wouldn't be as sharply focused.

It looks like an electrical/electronic problem. Possibly a dodgy USB lead/improperly seated lead.

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