Before I get too far into testing a camera, I do a series of exposures calculated to see if there are self-heating effects that might skew my test results. Since many of my tests involve making series of sequential exposures that are later subjected to statistical analysis, material self heating can force me to slow… [Read More]
Archives for 2015
a7RII read noise with EFCS on and off, plus silent, continuous
I have seen claims that the a7RII has lower precision with EFCS on than it does with it off. That makes no sense to me, and the a7, a7S, and a7II don’t do that. Since it’s pretty easy to check, I ran read noise curves both ways: The curves are virtually identical. While I was… [Read More]
Sony a7RII engineering dynamic range
I just got my first a7RII an hour ago, and one of the first things I did was measure the engineering dynamic range (EDR) versus ISO setting with the shutter in single shot mode, silent shutter turned off. Yeah, I know; normal people would go take pictures with their new camera. Not me, though; I’ve… [Read More]
Testing IBIS on the Kolari-modified a7II
So far, I’ve written 18 posts on the prototype Kolari-modified Sony alpha 7II with various rangefinder lenses attached, and also, as a control, with the Sony-Zeiss 35mm f/2.8 FE. The series starts here. Kolari has been shipping thin sensor stack modified a7’s for quite some time, and the a7II sensor and sensor stack are very… [Read More]
Sony a7II focus peaking anisotropy
It has seemed to me that the Sony alpha 7 camera line’s focus peaking is more sensitive to contrast variations in the horizontal than the vertical direction. I thought to devise a test. I wrote a Matlab script to generate a sinusoidal grating that varied in one direction in frequency, and in the other direction… [Read More]
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