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Canon EOS R6 mark II analysis for night/astro imaging

Started 2 months ago | Discussions thread
OP fred 76 Forum Member • Posts: 52
Re: Canon EOS R6 mark II analysis for night/astro imaging

DanInSoCal wrote:

Thanks for this, it's very interesting. Do you know any particular reason for the effects (both read noise and the "flattening" of the FFT at ISO 200?

No idea, this is how Canon’s engineers have programmed the DigicX processing of the signal…

Also, the ISO 100 results surprise me. I would expect the read noise to be more or less constant across the ISO ranges. I thought that read noise happened before the ISO gains were applied (so constant number of electrons, then multiplied at higher ISO's).

Noise adds up at several places :

- 1 - before amplification : it is therefore amplified the same way as the signal

- 2 - after amplification : it is not amplified, but just added to the signal (+ previous noise)

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