Stay at home
- Aug 16, 2012
Go back to my post number 18 where DxOmark's numbers are in the image. The R3 has a low light iso of 4086 calculated by DxOmark from their S/N data, the R5 is 3042. The difference in stops (ev) is log(base2) of 4086/3042 = 0.4256.Where are you getting a 0.42 stop difference in SNR? That would correspond to a ~2.5dB difference in DxO's measurements when what they've presented is more like a 0.5dB difference.
Note the iso for the R6 is 3394, only 20% poorer than that of the R3, and for which I calculated 0.27 ev. I think my calculations must be consistent with DxOmark as they write: "A difference in low-light ISO of 25% equals 1/3 EV and is only slightly noticeable." https://www.dxomark.com/dxomark-camera-sensor-testing-protocol-and-scores/#sports