It seems to be conventional wisdom (or as close as we can come to conventional wisdom about a relatively new phenomenon) that the PDAF striping in the Sony a7III only occurs at wide apertures and with fast lenses. Rishi Sanyal was kind enough to run a series of images of an overexposed circular light source with… [Read More]
a7III, a7RIII, a7II, a7SII, a9 PDAF striping
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]
GFX FW 3.0 focus bracketing with the 120/4 macro
Fujifilm just released firmware 3.0 for the GFX 50S. One of the new features is what Fuji calls Focus Bracketing. In my opinion, it is misnamed, as it is optimized for making exposures for stacking. However, I’ll use their terminology here. It works a lot like the Focus Shift Shooting feature in the Nikon D850…. [Read More]
Gone over to SSL
In order to provide better security, I’ve switched both my blogs over to secure sockets layer encryption. That means, that if you type http://{either site name}, your request will automagically be redirected to https://{either site name}. You will see a reassuring icon in your browser’s URL bar. In Firefox, it’s a green padlock. and in… [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]
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