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]
Leica 280/4 Apo-Telyt R on GFX 50R in infrared
The Fuji 250 mm f/4 G-mount lens doesn’t hotspot with a 720 nm conversion down to f/22. It does hotspot with the Fuji 1.4x teleconverter at f/11 and beyond. That’s a good choice for IR photography at 250 and 350 mm, but I wanted to try something else. Using a Kipon adapter, I mounted a… [Read More]
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