Forum: Pentax SLR Lens Discussion
12-06-2012, 08:17 PM
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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 |
src="https://www.youtube.com/embed/_ZM7WeycblM?controls=1" allowfullscreen> |
(Youtube demo - how to fix yellowing by exposure to UV light)
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