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02-09-2008, 10:48 AM   #1
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SMC Yellowing...

Hi this is my first post...and need some advice...
I have been toying with how to get my great SMC 50 f1.4 back to normal. I have a sharp copy of this lens but over time it has started to yellow as some older copies do, something to do with a radioactive element used in the lens. I have heard that you can wrap the lens in foil and put it in the sunlight and this will reverse or at least help to reduce the yellowing effect.
My question is what is the best way to wrap the lens? And some say to wrap the entire lese but others say to leave the mount end exposed?
Can anyone give me a better description on how to perform the foil fix?



Last edited by migz55; 02-09-2008 at 10:56 AM.
02-09-2008, 10:59 AM   #2
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Just wrap the black part of the lens barrel. Leave the ends (both) open. Place it in a window with direct sunlight for about a week and then turn it around for another week. If that doesn't cure it, then repeat for another 2 weeks. Try to keep the lens from getting too hot (small fan or open window) so the oil in the focus ring doesn't run on the aperture blades.
02-09-2008, 11:04 AM   #3
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thanks, I appreciate the quick reply...

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