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]
Archives for 2013
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]
Low-signal histograms at various ISOs
Rather than use dark noise as a stimulus as in the preceding post, I have made a series of measurements of the histograms of the Nikon D4 and D800E, and the Sony RX-1 and NEX-7 when presented with a featureless surface eight or nine stops below clipping. I did not include the Leica M9 because… [Read More]
Combed histograms
I started a thread on Luminous Landscape about computing unity gain ISO from a single exposure, and it’s gotten pretty interesting. There have been useful discussions about what good knowing the Unity Gain ISO is in picture-making. One of the discussion led me to make some test images and look closely at their histograms. In… [Read More]
Using photon noise to determine unity gain ISO, part 4
There’s enough data in the test exposure that I talked about at the beginning of this series to calculate the full-well capacity of the photosites in each camera, if we make the reasonable assumption that the manufacturers of the cameras set the gain of the amplifier at base ISO so that the ADC clips at… [Read More]
- « Previous Page
- 1
- …
- 27
- 28
- 29
- 30
- 31
- …
- 40
- Next Page »