This is a continuation of a series of posts on the Fuji GFX 50S. 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;… [Read More]
Archives for February 2018
Tuning D850 PDAF for aperture
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]
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]
Luminance and focus plane
Fair warning: this is a nerdy little post, of interest only to photo-techies and numbers junkies. Who’s left? Jack, I knew I could count on you. A reader took me to task several days ago for using the Adobe RGB green channel as a proxy for luminance when I measured focus accuracy and focus shift…. [Read More]
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