Depending on the spectral frequency, the penetration of UV through the
glass is an issue. Does the needed frequency reach the affected
element? Suspect that the only realistic path is to remove the
yellowed element for direct exposure. Whether your source produces the
resonant frequency UV needed is an unknown. The one thing about
sunlight is the complete spectrum. Also suggest serial test photos
with adjacent color cards.
Bill Hunter
On Thursday, August 14, 2003, at 11:34 AM, William Sommerwerck wrote:
I just finished exposing my 55/1.2 to ultraviolet light for 96 hours
(48
from the front, 48 from the rear). The yellowishness (which is more
like
weak tea) seems to have slightly diminished. But I'm not sure.
As much as I like having an ozone lamp (the UV source) running in the
bathroom, there doesn't seem much point in doing this ad infinitum. Has
anyone had success with UV?
This lens is still for sale. It's in awfully good condition.
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