Archived posting to the Leica Users Group, 1999/05/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]BD- You 'sposed to use the ashtray when the window's closed! :o}~ Dan - -----Original Message----- From: B. D. Colen <bdcolen@earthlink.net> To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us> Date: Wednesday, May 26, 1999 12:35 PM Subject: Re: [Leica] Facts versus opinions - can I explain in more detail what I meant? >At 12:21 PM 5/26/99 -0400, you wrote: >> 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! >Wait a minute, there, Dan'll...I've gotten BURNS on my left arm on long >drives with the window closed... > > > > > >>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 >> >