a7RIV EDR in 12-bit mode

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JimKasson
JimKasson Forum Pro • Posts: 26,303
a7RIV EDR in 12-bit mode
12

When you set the shutter drive mode to continuous, and the raw file format to compressed, the a7RIV operates with 12 bis of precision rather than the usual 13 bits in single shot compressed or 14 bits in single shot compressed or uncompressed.

One consequence of reducing the precision is faster conversion of the image data, and a higher frame rate. That’s the good news. The bad news is that the noise goes up and the dynamic range goes down. Here’s the effect on the engineering dynamic range (EDR) which for the purpose of this and most of my posts, I’m defining as full scale over the read noise (the DR when the SNR threshold is 0).

The 12-bit mode costs about a stop of EDR at low ISOs, and much less at high ISOs.

Details here:

https://blog.kasson.com/a7riv/sony-a7riv-edr-in-continuous-compressed-mode/

Jim

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