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Strange artifact in image

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6 replies to this topic

#1 Eric Horton

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Posted 22 September 2020 - 11:20 PM

I have a 294mc Pro cooled to -10 and see this strange stuff in the image.  it is always there no matter what temp.  I thought it was dust or something but the sensor is very clean.  I thought moisture but seems to be there if I'm at 10 or -10.  At this point, not sure what would be causing this.  has anyone seen anything like this in their images?  I took just a little snip while it was stretched quite a bit and zoomed in.  Hoping you can see it.

 

Thank you!!

 

 



#2 DSOs4Me

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Posted 22 September 2020 - 11:22 PM

You need to post the image


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#3 sharkmelley

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Posted 22 September 2020 - 11:28 PM

Post an example if you can.



#4 Eric Horton

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Posted 23 September 2020 - 12:57 AM

Sorry about that.  I have stretched it quite a bit.  If you zoom about the 5:00 position below the Bubble Nebula, it is like black speckles.

Attached Thumbnails

  • NGC7635_LIGHT__BayerMatrix__90s_BIN1_NoCooling_015_20200922_214029_639_GA_0_OF_0_W.jpg

Edited by Eric Horton, 23 September 2020 - 12:57 AM.


#5 Tapio

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Posted 23 September 2020 - 01:07 AM

My guess is mild frosting.

See if you get this another time and check sensor then.

 

That weave pattern is strange but I guess it's just not unbayered.



#6 Eric Horton

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Posted 23 September 2020 - 01:36 AM

Ok. I will redo the desiccant and see if that helps. It was not debayered. That was definitely due to shrinking to meet the attachment size limit.
Thank you

#7 Lead_Weight

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Posted 23 September 2020 - 08:36 AM

That's definitely frosting. You can also raise the temperature of your camera up to the point that frost stops forming, or cool it down more slowly in 5° increments every few minutes. These CMOS sensors have very little heat noise, so it's not important to keep it super cooled down.




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