A7s DxOMark

Started Jun 17, 2014 | Discussions thread
Happy Jones Regular Member • Posts: 366
Re: Shadow noise is where the largest difference is.

TrojMacReady wrote:

And arguably, shadow noise is usually the most dominant and limiting factor in low light shots in general.

The SNR graph is just for 18% gray, or middle gray. Not exactly shadows.

If you look at the full SNR graphs below 10% and especially towards 1% gray in the individual reviews or even the DR graph (which reflects shadow noise at high ISO too, since that's the most limiting factor for DR), you'll see the much larger differences.

For example, at a measured ISO 5400 from the A7S, it hits a 10 EV DR, similar to the DR of the A7 and A7R at around ISO 2200-2300. That's well over a stop difference already. Where the A7S touches about 9 stops DR at ISO 21k, the A7 and A7R hit 9 stops around ISO 4700-4900. That's more than 2 stops difference.

Up to a measured ISO 1600, differences in noise will not exceed half a stop, so no, you won't see significant differences there. As expected I would add.

If I have this straight all these cameras will perform near the same for shadow noise at ISO6400  and the A6000 will equal the A7 at ISO12800 because shadows noise is the most important factor to consider at higher ISOs?

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