a7S high ISO claim - - -over hyped or not ?

Started Jul 3, 2014 | Discussions thread
Rishi Sanyal
Rishi Sanyal dpreview Admin • Posts: 809
Re: a7S high ISO claim - - -over hyped or not ?

andrewD2 wrote:

ProfHankD wrote:

andrewD2 wrote:

The A7R is reading better in THEIR DR tests because of the resolution.

Read the full set of tests at DxO. Rather than viewing "scores," click on "measurements" and then "dynamic range." Two plots are available there. The "print" one shows the dynamic range at each ISO when all images are first scaled to 8MP (the default graph). The "screen" one shows the dynamic range at the native pixel resolution -- not giving the A7R (or A7) an advantage, but essentially penalizing them for their higher resolution.

At no time can the A7s resolve 36MP. That means if the detail is resolved in a moderate to high DR scene by the A7r DESPITE a little more noise per pixel at ISO100 it will still be an apparent winner. On an extreme DR scene who knows. 10 stop push back? Anyone tried that?


I'm not sure what you're trying to say, but if one camera has more base ISO DR than the other for one scene, it'll also have higher base ISO DR for any scene, no matter what the DR of that scene.

Apologies in advance if I'm misunderstanding what you're trying to say.


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