Author Topic: Bad Photos or bad workflow? Need help.  (Read 4530 times)

Offline bulrichl

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Re: Bad Photos or bad workflow? Need help.
« Reply #45 on: 2018 June 09 04:37:46 »
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However, one additional point is important: the data that I gave are valid only whith ImageStatistics set to 16-bit [0,65535].
I´ve set the ImageStatistics to 14-bit, because you wrote that I´ve got a 14-bit ADC in my Sony. :-\
When set to 16-bit in ImageStatistics I get 1000 (2s) to 1800 (5s).
The setting of 16-bit [0,65535] in ImageStatistics is correct if you keep in mind that the maximal values will be scarcely 2^14-1 = 16383 due to the 14-bit ADC.

The resulting values are still surprisingly low. My flat field box is rather bright, and I take flat frames (Canon EOS 600D = Rebel T3i) at ISO 100 and 1/60 s, undimmed.

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At the beginning of this thread you wrote that you are taking the flat frames with a flat field box. Exposure times of a few seconds seem unusually high then. Did you dim the flat field box?
Yes, I dimmed it a little bit. Should I drive with maximum performance?
Yes, I would use it undimmed and go for about 8000.

Bernd

Offline ArminPro

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Re: Bad Photos or bad workflow? Need help.
« Reply #46 on: 2018 June 09 12:53:34 »
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Yes, I would use it undimmed and go for about 8000.

No, I used it undimmed and got mean=7500 for an exposure of 1/50s and ISO=800.
Thanks!