The Nikon D4 uses all 14 of its bits all the time except for those lost to digital white balance. The Nikon D800E is at 14-bit device with all codes present except for those lost to digital white balance until the ISO knob gets to 3200. Then the gain of the analog amplifier stops increasing… [Read More]
Archives for March 2013
Low-signal histograms at various ISOs — Sony NEX-7
At ISO 100, it looks like the NEX-7 has a 12-bit ADC: At ISO 200, more noise: at ISO 400 still more noise. Note that we’ve not seen the bucket at 32 counts occupied in one of the histograms so far : At ISO 800, still more noise, and still nothing happening at count 32:… [Read More]
Low-signal histograms at various ISOs — Sony RX-1
At ISO 100, there’s a big surprise; the 14th bit is AWOL: At ISO 200, pretty musc the same thing with a bit more noise. The odd dip to the left of the mean of both green channels is curious: More of same at ISO 400: At ISO 800, the red channel is clipping: At… [Read More]
Low-signal histograms at various ISOs — Nikon D800E
At ISO 100, the D800E shows all codes in use except for the red and blue channel WB digital gain dropouts: At ISO 200 there are no surprises: At ISO 400, just some more noise. You can see that the blue channel has more digital gain applied to it than the red channel: At ISO… [Read More]
Low-signal histograms at various ISOs — Nikon D4
At ISO 100, the D4 gives the kind of histogram you’d expect (I’m pretty sure the gaps in the red and blue histograms are due to digital white balance after the ADC: At ISO 200, there are also no surprises: At ISO 400: At ISO 800: At ISO 1600, a little over twice the Unity… [Read More]
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