The second of three lenses that arrived yesterday...
This is an odd one. I posted on the forums a few days back asking if anyone knew about this lens, but it's a bit of a mystery.
It's a Lomography Zenit 2.5/32 "Lomogon" made by the Krasnagorsk factory in Russia. This is a full frame lens in brass (perhaps with a protective clear coat lacquer - I can't tell for sure) for Nikon F mount. There's no diaphragm - instead, the aperture is controlled by a thin rotating disc with circular f/2.5, 4, 5.6, 8 and 11 apertures cut out of it. I thought initially that this disc might be removable, but it's not.
It seems to me that this was intended to be part of the same series as the Peztval and Daguerreotype models, but unlike those I can find no mention of it on Lomography's website, on Kickstarter (where they fund some of their projects), or even with Google searches. Maybe it was a prototype for a model that was never released? But the serial number suggests there are at least 269 others somewhere, perhaps more. Very strange.
Optically, it's fun. Soft at f/2.5, noticeable vignetting, and a huge amount of (presumably intentional) coma, but good contrast. Colours are very saturated and pronounced. Sharpness and vignetting improve as you stop down. At f/11, it's sharper than the Zenitar-N 2.8/28 I posted about yesterday.
It's a beautifully made lens... Definitely a "Lomography" product