Rishi Sanyal of DPR made some test exposures of a centrally-positioned circular light source with several cameras: the Sony a7III, a7RIII, a7II, a7SII, and a9. In all cases, he used a Sony 85/1.8 wide open. The exposure was set to expose the light source sufficiently far so as to generate a lot of flare. I put… [Read More]
PDAF striping on the Sony a7RIII
I’ve been working on improving my toolset for analyzing the PDAF-pixel-induced banding that we’re seeing on some of the a7III demo shots, and that — through some pretty extreme measures — I got to occur on the a9. I wrote some Matlab code to find and measure the intensity of the artifacts. Then I set… [Read More]
Better D850 focus accuracy presentations
I haven’t posted for a while because I’ve been working on better ways to present the data that I’ve collected on focus accuracy for the a7RIII, the D850, and the GFX with various lenses. I’ve decided that I should make the following changes to my default graphs: Present more test cases on a single graph Present… [Read More]
Sony/Zeiss 35/1.4 Distagon sample variation
The Zeiss/Sony cobranded Distagon T* FE 35mm f/1.4 ZA lens gets some digital ink for its quality, but gets a lot more for its supposedly horrid copy variation. Those of you who are regulars readers her know that I believe that many, if not most, of the lenses returned by customers as decentered, tilted, or… [Read More]
D850 and a7RIII autofocus accuracy compared
This is a continuation of a series of posts on the Nikon D850. You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series; just… [Read More]
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