1951 Summitar 5cm f/2 lens which has a tidge of a haze issue that I think affects the image in this kind of light, but hey, it's what I have so far. Leica M8, no IR cut filter, pretty much default everything.
The Sonnar formula lenses were designed in a day when there were no lens coatings. The optical formula minimized the number of reflections. A Single-Coated Sonnar is about like a multi-coated modern lens.
These are all in-camera JPEG, everything set to "standard contrast" on the M8.
I use a Russian Jupiter-3 focus mount, take the optics module out of it. I transplant the optics module from the Contax RF lens into it, and shim it to properly focus with a Leica camera. I've done 15 conversions, kept three for myself- all a little bit different. One is a 1935 lens with coated front element, another is all uncoated, and the third is an early coated lens. I'm somewhat of a Sonnar fanatic.
This shot is wide-open and close-up on the Leica M8, using the Rangefinder for focus. This is conversion #15. It took about 8 hours to clean the optics, clean and lube the focus mount, and get the lens to work with this accuracy. Two set screws had to be drilled out. Some of these 70+ year old lenses need some work. This is a 1938 Uncoated 5cm F1.5 Sonnar.
You have to get the shim within 0.02mm for this accuracy, and pick the F-Stop that you want to optimize for. The Sonnar focus shift going from F1.5 to F4 is enough to throw the focus off. I generally optimize for F1.5 or F2, depending on how a lens will be used. Optimize for F2 means F1.5 will front-focus ever-so-slightly, and F4 will back-focus just a little. But both will be useable.
Actual hot lava, which you could hear creaking, groaning, and popping, along with the steaming vog it generates when it hits the water. I had brimstone hair all day. We were about 15 feet from the lava there. Sometimes, you could hear a ping on the hull--lava flowing under water would boil the water and the steam would come up in pressurized pockets, causing the noise.