[Digitalis]

I seem to recall that glass isn't a very good transmitter of ultraviolet light. Correct me if I'm wrong, I seem to recall that Standard glass will absorb as much as 70% UVA and UVB light. Hence, the use of specialised quartz lenses for ultraviolet photography. And then you have to consider modern multi coating techniques, I'm pretty sure they would have UV inhibiting coatings on most lenses. I have my doubts that much ultraviolet light gets through lenses these days...may I remind you how long it takes to sun bleach a radioactive Takumar...depending on the severity of the yellowing, it takes up to several weeks.


besides the ultraviolet spectrum, like infra-red does not focus on the same plane as visible light. So even if it is getting through to the sensor, the effect it would have would be an insignificant variable.