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You are here: Home / The Last Word / D4 and D810 ISOlessness

D4 and D810 ISOlessness

December 23, 2014 JimK Leave a Comment

I went back to the D4 and D810 data sets and ran the ISOlessness test on them without any data set scrubbing.

Here are the results with a target mean of 0.01 for ISO 6400 for the D4 and ISO 4000 for the D810 (the tested ISOs are two-thirds of a stop apart because the cameras’ base ISOs are two thirds of a stop apart.

D4ISOp01

D810ISOp01

There are a couple of things to note. First, the absolute SNRs at high ISOs are higher for the D4, even though the ISOs are higher fo the D4. Remember that the D4 has fewer than half as many pixels as the D810, though. Second, at low ISOs, the D810 has better performance than the D4. The D810 is more nearly ISOless.

Doubling the mean values:

D4ISOp02

D810ISOp02

More of same.

Doubling the mean again:

D4ISOp04

D810ISOp04

The D4 maintains its half-stop advantage at high ISOs, and the D810 curves are approaching ruler-flatness.

D4ISOp08

D810ISOp08

And finally, at high-ISO means of middle gray:

D4ISOp18

D810ISOp18

 

 

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