Archived posting to the Leica Users Group, 1999/05/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Whew! Long post! But interesting! Insofar as UV absorbing cement- The fact is that glass, even optical glass absorbs most UV- that's why you don't get a very good tan through a glass window! And should you want to do UV photography, where UV is used to make the image, the only lens that is useful there, is a lens, the elements being made of quartz crystal. Hasselblad had one used mainly for questioned documents examination, and ran about 6 or 7000 USD about 20 years ago. In photofinishing, the only problems I find with UV comes from disposables with plastic lenses, and some P&S cameras with plastic lenses. Mainly the disposables- outdoor photos sometimes require that 'yellow' be added to a print since the UV really stimulates the blue sensitve layer more than the others. Dan