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You are here: Home / The Last Word / Sony a7RII FW 3.3 raw dark-field histograms, ISO 100-1600

Sony a7RII FW 3.3 raw dark-field histograms, ISO 100-1600

December 1, 2016 JimK Leave a Comment

A little over a year ago, I posted dark-field histograms from the Sony a7RII with FW 2.0, which was the first firmware release to support uncompressed raw. Today I’m doing a similar post for FW 3.3. You might want to open up both posts in separate tabs to see the differences.

ISO 100, uncompressed
ISO 100, uncompressed

The green histograms are ragged, but otherwise the results are similar to FW 2.0. But things look different with compressed raw:

 

ISO 100, compressed
ISO 100, compressed

The red and blue channels have 13-bit precision, but the green channels have only 12 bits. They had 13 before.

 

ISO 200, uncompressed
ISO 200, uncompressed

 

ISO 200, compressed
ISO 200, compressed

Again, the green channels have only 12 bits of precision.

ISO 400, uncompressed
ISO 400, uncompressed

 

ISO 400, compressed
ISO 400, compressed

 

ISO 500, uncompressed
ISO 500, uncompressed

 

ISO 500, compressed
ISO 500, compressed

When the ISO changes to 640, the conversion gain goes up, and the read noise goes down:

ISO 640, uncompressed
ISO 640, uncompressed

 

ISO 640 compressed
ISO 640 compressed

 

ISO 800, uncompressed
ISO 800, uncompressed

 

ISO 800, compressed
ISO 800, compressed

 

ISO 1600, uncompressed
ISO 1600, uncompressed

 

ISO 1600, compressed
ISO 1600, compressed

In all cases the big difference is that the green compressed precision has dropped from 13 to 12 bits. I don’t know why this is happening. I should probably point out that the camera on which I performed the FW 3.3 tests was — I think — different from the one I used for the FW 2.0 histograms.

Curiouser and curiouser.

The Last Word

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