The lens was made at Lenkinap (one of the LOMO factories) in 1960 (#601780).
I heard rumors that early RO series lenses are better than later OKS series since they were made using trophy glass from Germany. But I can't confirm these rumors by tests.
For sale is optical block. It has aperture (T/2.2-22), but doesn't have a focusing mount, so you'll have to adapt it to your system yourself.
This lens is worth to invest efforts into it. 16 diaphragm blades provide perfect bokeh. Cine optics gives soft image. 75mm focal length is one of the best choices for portrait photography. The lens covers full 35mm frame (24x36mm) easily (though it was purposed for 35mm cine cameras). Depth of field is shallow enough to separate an object from background clearly, that gives excellent impression and adds cine-like feeling to a video shot with such lens. Combine all this factors, and you'll understand why so many people hunting for such lenses to adapt them for their DSLR's and camcorders.
Max. diameter: 55 mm
Mount diameter: 41 mm
Length: 66 mm
Weight: 334 g
Filter thread - 44x0.5mm
Used condition. Rear barrel rim has two dents. They don't affect usability, so there is no need to fix this.
Aperture ring is bit tight and jerky. But positive effect of this issue is dry diaphragm blades without oil on them that is quire rare case with LOMO lenses. If you wish, you may lubricate the mechanism.
Glass is in very good condition. There are some dust and cleaning marks, of course, but no fingus, no scratches, no glass chips. Coating layer is undamadeg. There is nothing that may affect image quality.
So, this is great optical block that you may adapt to your camera.
Используйте пробелы для отделения меток. Используйте одинарные кавычки (') для фраз.