I made a series of lens-cap shots on the a7S with the ISO set to 12K, the drive mode at single shot, and the shutter speed varied in 1/3 stop intervals from 1/8000 second to 8 seconds: Read noise stays fairly constant as the shutter speeds get longer until about 1/10 second, when it starts to… [Read More]
Archives for July 6, 2014
Sony a7S read noise vs ISO
I’m been showing you histograms of the Sony alpha 7S when making images of the back of the lens cap. We saw some evidence that the chip and/or raw processing was different at different ISOs. I suspect it’s the chip, at moderate ISOs, and processing at nosebleed ones. To get a better look, I measured… [Read More]