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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

Capturing Flats: Strange ADU calculated during calibration

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I have been trying to use the calibration section for capturing flats for my Canon 450D. I set a target of an ADU of around 2750, and put in an initial exposure of 0.25 seconds. Whenever I do this (even with other initial exposure lengths), on the 3rd exposure during calibration, Ekos reports a really weird ADU value in the console which is a massive number. I have attached a log, see line #170, the number calculated for ADU is of the order of 10^120.

I ended up just using manual exposure length as I could not get the calibration setup to work because of the above issue. Has anyone else come across this strange ADU value being shown?
6 years 1 month ago #23529
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I don't know about the issue, but... why would you set ADU at 2750? Is it 12bit camera?
6 years 1 month ago #23530

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It is 14-bit, but when I shoot a really long (eg. 30s) flat exposure @ ISO200 it tells me that the ADU is around 4800 or so?
6 years 1 month ago #23531

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I got this not-so-similar-but-also-wrong result when trying the calibration:
[2018-02-23T20:02:07.056 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Current ADU =  247.617  targetADU =  30000  Exposure Count:  1137
[2018-02-23T20:02:07.057 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Running polynomial fitting. Found  3  coefficients.
[2018-02-23T20:02:07.058 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 0 = 0.00921966
[2018-02-23T20:02:07.058 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 1 = -1.37143e-08
[2018-02-23T20:02:07.058 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 2 = 4.1258e-13
[2018-02-23T20:02:07.059 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: next FLAT exposure is  0.00917956
[2018-02-23T20:02:07.059 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Current ADU is 248 Next exposure is 0.009 seconds."
[2018-02-23T20:02:08.074 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Capturing image..."
[2018-02-23T20:02:10.856 Paris, Madrid WARN ][        org.kde.knotifications] - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
[2018-02-23T20:02:10.857 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsp11272"
[2018-02-23T20:02:10.908 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsp11272"
[2018-02-23T20:02:10.972 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Current ADU =  247.607  targetADU =  30000  Exposure Count:  1138
[2018-02-23T20:02:10.973 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Running polynomial fitting. Found  3  coefficients.
[2018-02-23T20:02:10.973 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 0 = 0.00921962
[2018-02-23T20:02:10.973 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 1 = -1.37076e-08
[2018-02-23T20:02:10.974 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 2 = 4.12395e-13
[2018-02-23T20:02:10.974 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: next FLAT exposure is  0.00917954
[2018-02-23T20:02:10.975 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Current ADU is 248 Next exposure is 0.009 seconds."
[2018-02-23T20:02:11.966 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Capturing image..."

The result of the fitting function isn't suitable for 30K ADUs, and the algorithm loops indefinitely. This one was the 1138th...

Side note, this was a dusk flat calibration. The first frames went well, but at some point the algorithm decided it should start reducing the duration:
[2018-02-23T18:21:39.392 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Current ADU =  28632.7  targetADU =  30000  Exposure Count:  37
[2018-02-23T18:21:39.394 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Running polynomial fitting. Found  3  coefficients.
[2018-02-23T18:21:39.394 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 0 = -0.153707
[2018-02-23T18:21:39.395 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 1 = 1.08598e-05
[2018-02-23T18:21:39.396 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 2 = -1.76574e-10
[2018-02-23T18:21:39.397 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: next FLAT exposure is  0.0131721
[2018-02-23T18:21:39.398 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Current ADU is 28633 Next exposure is 0.013 seconds."
[2018-02-23T18:21:39.409 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Capturing image..."
[2018-02-23T18:21:42.166 Paris, Madrid WARN ][        org.kde.knotifications] - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
[2018-02-23T18:21:42.167 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsT11272"
[2018-02-23T18:21:42.279 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsT11272"
[2018-02-23T18:21:42.440 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Current ADU =  28586.4  targetADU =  30000  Exposure Count:  38
[2018-02-23T18:21:42.441 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Running polynomial fitting. Found  3  coefficients.
[2018-02-23T18:21:42.442 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 0 = -0.151475
[2018-02-23T18:21:42.443 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 1 = 1.07239e-05
[2018-02-23T18:21:42.444 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 2 = -1.74519e-10
[2018-02-23T18:21:42.445 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: next FLAT exposure is  0.0131745
[2018-02-23T18:21:42.445 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Current ADU is 28586 Next exposure is 0.013 seconds."
[2018-02-23T18:21:42.457 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Capturing image..."
[2018-02-23T18:21:47.352 Paris, Madrid WARN ][        org.kde.knotifications] - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
[2018-02-23T18:21:47.354 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsj11272"
[2018-02-23T18:21:47.470 Paris, Madrid INFO ][           org.kde.kstars.fits] - Loading FITS file  "C:/Users/TallFurryMan/AppData/Local/Temp/fitsj11272"
[2018-02-23T18:21:47.634 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Current ADU =  28522.5  targetADU =  30000  Exposure Count:  39
[2018-02-23T18:21:47.635 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Running polynomial fitting. Found  3  coefficients.
[2018-02-23T18:21:47.636 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 0 = -0.148286
[2018-02-23T18:21:47.636 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 1 = 1.05262e-05
[2018-02-23T18:21:47.637 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: Coeff # 2 = -1.71475e-10
[2018-02-23T18:21:47.638 Paris, Madrid DEBG ][   org.kde.kstars.ekos.capture] - Capture: next FLAT exposure is  0.0131727
[2018-02-23T18:21:47.639 Paris, Madrid INFO ][   org.kde.kstars.ekos.capture] - "Current ADU is 28522 Next exposure is 0.013 seconds."

-Eric
6 years 1 month ago #23619

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The problem in OP is due to corrupted ADU RAW value. I think it might be due to debayered values which were not initialized to zero. I fixed that in GIT but not sure if this is the true cause of your issue, but it's worth a shot. It should be release for KStars 2.9.3 which is due tomorrow.
The following user(s) said Thank You: Feilim Breatnach
6 years 1 month ago #23668

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Thanks Jasem, I will try version 2.93 when it is released and report back here.
6 years 1 month ago #23669

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Just to add a note, I finally tried out version 2.93 yesterday and the issue I reported with strange ADU value now appears to be resolved for me. The maximum ADU also now appears more to be what I would expect for a 14-bit DSLR (verison 2.93 reports around 15900 for a 20second exposure, whereas the previous version was reporting a value of around 8000 for the same exposure length / target brightness).

Thanks for the update :)
6 years 2 weeks ago #24079

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