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]

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]

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]

This is part 18 in a series of posts on a prototype of the Kolari Vision thin-stack sensor modification for the Sony a7II. The series starts here. The Leica 16-18-21mm f/4 Tri-Elmar-M performs well on the a7II at all focal lengths, and better at 21mm with the Kolari stack.  How does the Kolari thin stack… [Read More]