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Mark's Ashai Super Takumar 50mm F:1.4

Came with the Mamiya Sekor DTL-500 on 11-8-22, M42 mount. sn 2194454. This lens is radioactive. The thoriated glass develops the brown shade you see here. I've read that it can be reversed, but not sure I want to. Using my Mazur PRM-7000 on it was the first time I saw it pick up more than background. I've read that the radiation fogs or streaks film, so I won't be using it, except to test my geiger counter. It really takes off next to this lens, the back in particular.

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