I brought the dark-field exposures of the previous post — plus a few more so that I has an exposure every 1/3 stop — into RawDigger, selected the central 90% of the frame, and measured the standard deviation of the read noise. I normalized the results to a full scale count of 16383, and here’s the… [Read More]
Nikon D810 dark field histograms
Here are a series of D810 raw histograms of a dark field at selected in-camera ISO settings. The field I chose was the back of a Sigma 50mm f/1.4 DG lenscap. To make sure it was really dark, I set the lens to f/16 and the exposure time to 1/8000 second. I used single shot… [Read More]
Nikon D810 self-heating
Before I start seriously testing a camera, I make a series of dark field exposures to see if there are self-heating effects that would compromise results made with rapid series of shutter activations. Of late, it’s not been a problem. Here’s the standard deviation of each raw channel for a series of exposures of a… [Read More]
Nikon D810 testing
The D810 arrived today. I’ll be testing it over the next few weeks. Some things that I’m curious about: How does the read noise compare with the D800E? Does the new Sony sensor have some tricks up its silicon sleeve, like the one in the a7S? How about photon noise? Are the full well capacities… [Read More]
How read and quantizing noise interact
The Sony a7S has raw bit depths of 12 or 13 bits depending on the way the camera is set. It also has low read noise in many circumstances. The combination of the two conditions has lead several people to ask me if, when I think I’m measuring read noise, am I sometimes measuring just the… [Read More]
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