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Forum: Pentax SLR Lens Discussion 12-06-2012, 08:17 PM  
Auto Chinon MC 50mm 1.4 / 1.7, yellowing?
Posted By PJ1
Replies: 11
Views: 10,640
I recall reading some years ago that yellowing was caused by radioactive changes in the glass over time. A quick search on the internet confirmed my memory! Here are some sites:

Radioactive lenses - Camerapedia (explanation of the source of radioactivity (thorium oxide) and list of lenses known to be affected)

The Classic Camera Repair Forum: Summicron 5cm, Yellow lens (How to fix yellowing by exposure to UV light)
















You Tube



(Youtube demo - how to fix yellowing by exposure to UV light)
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