2 hours ago
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Re: 50mm manual focus lens for X Pro1?
In reply to Shawn67,
5 months ago
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Shawn67 wrote:
Yours has the metal focusing rings I take it? The yellow is due to the radioactive coatings used on that lens. If you expose it to UV light you can reverse the yellowing. Sunlight can apparently do it.
The Rokkor 1.2 I have on the way has the newer coatings which don't yellow. Sounds like I ought to pick up a yellow filter for it when shooting B&W though.
Shawn
Slight correction: It isn't the coatings that were hot in the old radioactive lenses, it is the optical glass itself---usually one, but sometimes more that one of the elements. As you have stated, many have claimed that exposure to UV/sunlight reverses the yellowing.
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-KB-
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