Uncommon Helios 44 - 7 (never seen before, really)

[Ultrapix]

Does anybody have ever seen a similar lens? It's a puzzle, to me. The mount is a converted (to M42) Nikon. The rings have a shape that I didn't met before. I hope somebody will enlight me a little...

Thanks in advance

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[kansalliskala]

Someone converted ... what?

[sergtum]

I have the same item.

DSC01769 by Mr TTT, on Flickr

this is a lens from the Zenit 7 camera. the Helios 44-7 lens has an M42 connecting thread. the lens was equipped with a special connecting ring for mounting on the Zenit-7 camera.

http://camera-wiki.org/wiki/Zenit_7

next text in Russian

http://www.zenitcamera.com/archive/zenit-7/index.html

http://www.zenitcamera.com/archive/lenses/helios-44.html

https://fotoussr.ru/cameras/zenit-7/

[Ultrapix]

Puzzle solved, thank you!