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Pentax Super-Takumar 50mm F1.4 M42 Screw Mount Thorium Glass Lens - Victory Camera
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Dodd Camera - Have you ever seen a lens that appears yellow when you peer through it? If it's older than the the mid 1970s, there's a possibility that the glass is
The HORRIFYING Truth about RADIOACTIVE Camera Lenses - YouTube
Your thoughts on radioactive lenses ? I have a Takumar 50mm F1.4 with thoriated glass. I really like the render given by that lens ! : r/VintageLenses