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Automatic Exposure calculation for Flats is faulty

  • Posts: 149
  • Thank you received: 10

Automatic Exposure calculation for Flats is faulty was created by Amin Sharaf

I was trying to take Flats with target ADU of 50 (8 bit per pixel) and tolerance 1. The calculation started correctly and reduces the exposure times, but then it starts jumping around, please see screenshot.
Skywatcher Newton 200/1000, Sharpstar 60ED, Canon Lenses
Skywatcherr EQ-6 R, AZ-GTI
StellarMate @ Raspberry Pi 3B+
ASI 183 MC Pro
ASI 290 MC guiding cam on APM 60 ImageMaster
Sesto Senso 2 Focuser + Astromechanics Canon Focuser
5 years 8 months ago #28557
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Replied by Eric on topic Re:Automatic Exposure calculation for Flats is faulty

Increase tolerance. Flats are normalized when used for calibration, therefore the precision of the mean ADU is not critical.

-Eric
5 years 8 months ago #28558

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  • Posts: 149
  • Thank you received: 10

Replied by Amin Sharaf on topic Re:Automatic Exposure calculation for Flats is faulty

Hi Eric,

I used a different starting exposure and it works fine. Its just seems after like 5 iterations the algorithms screws up and alters the exposure in the wrong direction. As you can see in the screenshot:

exposure was 0.026 seconds and ADU was too high, but it actually increases the exposure to 0.080 seconds. That does not make sense to me.
Skywatcher Newton 200/1000, Sharpstar 60ED, Canon Lenses
Skywatcherr EQ-6 R, AZ-GTI
StellarMate @ Raspberry Pi 3B+
ASI 183 MC Pro
ASI 290 MC guiding cam on APM 60 ImageMaster
Sesto Senso 2 Focuser + Astromechanics Canon Focuser
The following user(s) said Thank You: Eric
5 years 8 months ago #28560

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