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]
Leica 280/4 Apo-Telyt R at 950 nm on GFX 50R
I tested my LifePixel-modified (720 nm option) Fujifilm GFX 50R with the Leica 280 mm f/4 Apo-Telyt R lens and a 950 nm lowpass filter. I added a +100 contrast boost in Lightroom. Poor coverage, no hotspots. Still has corner vignetting. No hotspots. A little bit of corner vignetting. No hotspots. No corner vignetting. No… [Read More]
Fujifilm 250/4 in 830 nm infrared on GFX 50R
I put a B+W 830 nm lowpass filter on my LifePixel-modified (720 nm option) GFX 50R and checked for hot spots on distant scenery with a +100 contrast boost. Well, that’s encouraging. How about with the Fujifilm 1.4x telextender? Not good at all. Hotspots at every… [Read More]
- « Previous Page
- 1
- …
- 85
- 86
- 87
- 88
- 89
- …
- 572
- Next Page »