Help understanding input referred read noise?

Started May 9, 2018 | Questions thread
JimKasson
JimKasson Forum Pro • Posts: 24,700
Re: Pentax K-1II NR at ISO640
2

Jack Hogan wrote:

bclaff wrote: Sadly, input-referred read noise alone isn't a clear indicator of dual conversion gain:

In this case dual conversion gain for the Sony but noise reduction for the Pentax.

Maybe both? RN stays above a 'realistic' 1 e- after alleged noise reduction. I wonder why they would do that at such low ISOs. Is it possible that we are picking up on some other signature of the image-capturing process that we are interpreting as NR? The power spectrum does seem to flatten out in the last 20% of the spectrogram.

Rishi sent me some dark-field files last week. The spectra are high-frequency deficient at ISO 640 and above.

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