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Dark Frame at -20 deg.C (QHY165C)

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#1 wallacelock

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Posted 03 December 2019 - 05:14 AM

Is it normal to have this pattern of dark frame at -20 deg.C?

This is the combined master dark with 25 x 300s frames at -20 deg.C.

There is no such pattern when the camera is running at -10 deg.C.

 

Thanks.

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  • dark-BINNING_1-EXPTIME_300s (-20C).jpg


#2 cccha

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Posted 04 December 2019 - 11:38 PM

Could this be the case for the single dark frame? Can you send me 25 dark frames? Let's analyze what causes it. You can send my email (cha@qhyccd.com)



#3 MapleEve

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Posted 05 December 2019 - 04:46 AM

Did you take the dark with all other stuff or just the camera itself?

Is the room dark or light?

#4 wallacelock

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Posted 11 December 2019 - 10:44 PM

Did you take the dark with all other stuff or just the camera itself?

Is the room dark or light?

 

I took off the imaging chain from the camera when taking the darks.  The room is dark enough.

 

Actually I took the darks with the same method for many times in other temperatures, e.g. -5 and -10 deg.C, and they are normal.




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