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Old November 28, 2012, 05:40 PM   #11
30Cal
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Join Date: December 3, 2002
Posts: 1,106
I think your camera tech was thinking of the old Takumar (Pentax) lenses that yellow over time (something to do with the decay of Thorium in the glass or coating). Supposedly you stick them in the sun for a couple weeks and it'll clear up.
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