A few weeks back, I did a series of dark-field exposures with the Sony alpha 7S (a7S) at all available ISO settings. After some processing, I produced this graph: There are two places in the curve where sudden — and unexpected, at least by me — drops occur as the ISO is increased. The first… [Read More]
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Sony a7S testing
A Sony alpha 7S arrived yesterday for testing. Same origami box as the other alpha 7 cameras. Same lightweight documentation. Two nice differences: the a7S ships with two batteries and a battery charger. I guess they figure videographers will be going through batteries at a good clip. In one sense, the arrival of the camera… [Read More]
Sony a7 noise floor
Here’s the average value of the standard deviation of noise floor in the central 90% of the image vs ISO at 1/30th second: If the amplifiers and the analog to digital converters in the a7 were perfect, and all the read noise came from the sensor array itself, then the read noise would double every… [Read More]
Testing the Sony a7, part 1
Well, it’s not really part 1, since I did some shutter shock testing earlier. But now I know that the camera’s vibration is no problem, I’ll give it my regular testing regime. [Added later: If you’re interested in the a7 noise floor in single shot mode, look here. If you care that the a7 becomes… [Read More]
Sony a7R SNR testing analmoly
There is an odd discrepancy between the SNR data for he D800E and the a7R. Here’s the low-midtone SNR vs ISO setting for the a7R, from a few posts back: Here’s the same graph for the D800E: Notice that the D800 SNR’s are a little over a half a stop worse than the a7R ones?… [Read More]
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