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]
IR images without demosaicing, revisted
A long time ago, I experimented with developing deep infrared images without demosaicing. I used some of my own images with a camera that had an antialiasing filter, and some the I got from Lloyd Chambers using a camera with no AA filter. I found very small improvements in the ones without the AA filter…. [Read More]
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