Archived posting to the Leica Users Group, 2000/07/16

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Subject: [Leica] RE: WAS; UV filter and Dan Honemann
From: Jim Brick <jim@brick.org>
Date: Sun, 16 Jul 2000 21:49:26 -0700
References: <396DD6D2.89DFF84@home.com>

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

In reply to: Message from Ted Grant <tedgrant@home.com> ([Leica] WAS; UV filter and 21mm now 15 mm!)