Archived posting to the Leica Users Group, 1999/05/26

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Subject: Re: [Leica] Facts versus opinions - can I explain in more detail what I meant?
From: "B. D. Colen" <bdcolen@earthlink.net>
Date: Wed, 26 May 1999 12:22:56 -0400

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
>