Darks not calibrati...
 
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Darks not calibrating  

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(@darko7411)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 9
October 30, 2021 06:38  

I have a strange issue going on that I can't seem to figure out. So, with my OIII data, the final stack is pretty much black when I use dark frames to calibrate(no flats were used). But, when I stack without darks applied, I have a normal-looking image, but with amp glow. Can someone please help me understand what's going on? My dark frames are the same gain and exp length as my light frames. Also, my HA data calibrates just fine. The main difference is that my OIII data is poor. My guiding was not great, very heavy winds last night, so my stars are elongated. I've attached a couple of images, first one is the OIII data with dark frames and the second without darks applied. The last image is the HA stack with darks applied and amp glow removed. Thanks in advance.

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(@wvreeven)
Galaxy Admin
Joined: 3 years ago
Posts: 1304
October 30, 2021 13:50  

@darko7411 Hi Thomas. Did you use the same software for taking the darks and the OIII lights? Is the offset applied to the darks and the OIII lights the same? Did you use a master dark for calibrating the OIII lights and, if yes, does it help if you use the raw darks instead?


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(@darko7411)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 9
October 30, 2021 20:16  

@wvreeven

So I re-shot my darks and the stack is no longer black, so my offset must have been off. But now its not removing the amp glow. Any ideas?

image

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(@wvreeven)
Galaxy Admin
Joined: 3 years ago
Posts: 1304
October 30, 2021 22:03  

@darko7411 Again, did you use the same software for taking the darks and the OIII lights? Is the exposure time of the darks the same as that of the lights? Are you using any bias frames too and, if yes, is the offset for those the same as for the darks and lights?


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(@darko7411)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 9
October 30, 2021 22:35  

@wvreeven

  • Yes, same software, NINA. Same offset, gain and exp length for the darks and lights. No bias or flat frames used, just darks and lights.

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(@darko7411)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 9
October 31, 2021 00:07  

@wvreeven

I figured it out. My binning didnt match from lights to darks. Good to go now, thanks for your help.


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(@wvreeven)
Galaxy Admin
Joined: 3 years ago
Posts: 1304
October 31, 2021 12:04  

@darko7411 Nice catch and I am glad you figured it out. I'll add that to my list of questions to ask if someone else has a similar issue in the future. 


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