Archived posting to the Leica Users Group, 2001/11/14

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Subject: Re: [Leica] High altitude question
From: "W Larsen" <wlarsen@almondmedia.com>
Date: Wed, 14 Nov 2001 20:22:40 -0800
References: <5.1.0.14.2.20011114175935.00a727d0@pop.2alpha.net>

Neither the uv filter nor the skylight
filter will help you.  Follow Jim's
advice.  While thinner air is an
explanation, you need to understand that
as light passes through atmosphere, it
changes color.  Ultimately, as it passes
throught the windshield of your car, and
some become infrared which is part of
the reason that your car heats up inside
disproportiantely.   FOLLOW JIM'S
ADVICE.

Regards, Will Larsen (who spent long
months in learning how to use aerial
photography)


> Dare I even say the words "Ultra
Violet Filter...?"
>
> The blue cast is happening for the
same reason you get sunburned at high
> altitude. Thinner air, more UV.
>
> The clear UV filter will filter out
aerial haze and get rid of some of the
> blue.  A skylight (1A) filter is a
little pinkish, and will warm things up
> a bit more.  If it were me, I'd use
the 1A for shadow pictures, and the UV
> for shots with distant views.  If you
don't want to swap filters a lot,
> just use one or the other, and tweak
the color balance in your image editor.
>


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In reply to: Message from "Peter A. Klein" <pklein@2alpha.net> ([Leica] High altitude question)