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Hey guys, last week I got a vintage lens (by chance). It's a Wollensak Raptar 50mm f/1.5. I've started reading a bit about the company (located in America) which was building lenses from 1902 to 1972 in rather small numbers, and the raptar seems to be one of their more uncommon lenses. The lens itself is in very good shape. No scratches, neither on the body nor the glass, no fungus, not much particles inside (actually i can only see three small dots that shouldn't affect image quality at all). It was a bit dirty on the outside, but after cleaning it looks like new. The aperture looks good, has 15 blades, does not stick and is easy to move. I've already done some test shots with the lens hand-held in front of the camera. The results look promising, apart from the boring subject and the light leaking through my fingers onto the sensor, reducing contrast. So I'd like to adapt it to X-Mount. And here comes the first problem: The lens itself does not have a focusing mechanism. I think I can solve the problem by using one of these adapters: http://www.kipon.com/en/articledetail.asp?id=76 They have a built in helicoid that can move the lens up to ~10 mm away from the "infinity focus" position, so I should be able to focus closer. It won't be macro, but at least a "normal" range, I hope. However, I didn't find a solution for the second problem myself: I don't recognise the mount of this lens. I've got a picture attached below. The thread seems to be about M41. It's definitely NOT M42, I've tried that already. Does anyone know what mount this is, and what flange focal distance it has? Because only by knowing the flange focal distance, I can modify one of those Kipon adapters (probably the M42 version) to accomodate the lens. Any help is appreciated.