Originally posted by Medex I can't speak for sure about UV photogtaphy, but Klaus Schmit can. He is in that field and as I remember he uses special lenses (quartz), because ordinary multicoated lenses block UV.
Yes, I know his web page. There's an even better resource:
Ultraviolet Photography He is one of the contributors there, too.
Those dedicated UV lenses are not for normal people, costing between 5000-8000 euros a piece. We could have afforded one at work, of course, but the focal lengths are useless for our work: the shortest of the dedicated quartz/fluorite lenses is 60mm. We need 35mm. Fortunately there are dozens of old, simple lenses that pass UV well enough. Those are what we use. It is the lack of multicoating, use of UV-passing lens cements and overall simple construction.