I received a request investigate whether the histogram in the GFX cameras when the display mode is set to “Natural Live View” faithfully represented the raw histogram. Spoiler alert. It does not, at least in all circumstances. I’d never paid any attention to that mode before. I looked it up in the GFX 100S searchable… [Read More]
Diffraction and sensors
A couple of days ago, a poster on the DPR MF board made a remarkable claim in response to speculation about a 100 MP X-series Hasselblad. One word, diffraction. The X1DII and X1D doesn’t have, none or perhaps very little that I’ve noticed anyway. As you might expect, I challenged that assertion: Lenses suffer from… [Read More]
Math in photography
I received an interesting message today: I am at the moment studying math and chemistry (to become a teacher) and am about to start with my diploma/master thesis. I thought writing about a mathematical aspect in photography , and since you are one of the best educated people I know in that area, I wanted… [Read More]
Does repeated JPEG compression ruin images?
Note: this post has been extensively revised. I keep reading assertions like this one that was just posted here: When saving and opening a JPEG file many times in a row, compression will ruin your image. I knew from hanging around with some of the IBMers working on the original JPEG standard that recompressibility with no… [Read More]
Leica 90/2 Apo-Summicron ASPH-M on GFX 50S
The M-mount Leica 90 mm f/2 Apo-Summicron is a special lens. Almost as expensive as the Otus 85/1.4, it doesn’t quite measure up to the Zeiss lens in the standard lens quality metrics. But in spite of — probably because of — its optical deficiencies, it does a superb job of rendering some things. In… [Read More]
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