Archived posting to the Leica Users Group, 2000/07/17

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Subject: [Leica] RE: WAS; UV filter and Dan Honemann
From: Robert Appleby <robert.appleby@tin.it>
Date: Mon, 17 Jul 2000 10:25:47 +0200

>>>>>
At 01:20 PM 7/16/00 -0400, Dan Honemann wrote:
>
>Well, here's a different take on the uv protection debate: what are the
>effects of uv rays on the eye that is viewing through an SLR with a
>telephoto lens attached (assuming the eye is not otherwise protected by
>eyeglasses or sunglasses)?  Could the uv filter help protect the eye from
>damaging uv rays?
>
>Dan (future uv filter salesman (who, by the way, doesn't use 'em))
> 

No. All Leica and Zeiss (and I suppose brand-x) lenses have full UV
inhibiting built-into the lens. The cement between the elements and the
glass itself contains UV inhibitor that is as good as, probably better
than, any UV filter. Therefore, a UV filter is useless for inhibiting UV as
the lens does it already.

Jim

<<<<<
I translated a spectacle lens technical document - zeiss or roìdenstock or
whatever - some time back and was struck by the assertion that _all_ glass
spectacles offer full UV protection, there was no need to have special
coatings etc.. Maybe I got hold of the wrong end of the stick, but since
then I've been wondering about the need for UV filters for UV protection. I
just use them for dirt etc. protection.
Rob.

Robert Appleby
V. Bellentani 36
41100 MO
Italy
tel. (+39) 059 303436
mob. (+39) 0348 336 7990