Archived posting to the Leica Users Group, 2001/11/15

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Subject: RE: [Leica] Re: High altitude question
From: "Zeissler, Mitch" <mzeissle@gcipoa.gannett.com>
Date: Thu, 15 Nov 2001 03:53:25 -0500

Thanks, I'll try the KR3.  I am aware of the color temp vs. UV issue,
but did not know how others compensate for it.  Other than ND filters on
the Noct, I don't use filtering of any kind.

/Mitch Zeissler

- -----Original Message-----
From: Jim Brick [mailto:jim@brick.org]
Sent: Wednesday, November 14, 2001 12:01 PM
To: leica-users@mejac.palo-alto.ca.us; leica-users@mejac.palo-alto.ca.us
Subject: [Leica] Re: High altitude question

Use a B+W KR3 filter. The higher you go, when there is clear blue sky,
the 
higher the color temp as there is less atmosphere (moisture & stuff that
is 
packed down at lower elevations). I've taken ton's of Leica photographs
in 
the Colorado Rockys and after the first roll, started using a KR3, and
all 
was well after that.

Please note, it is NOT UV that is causing the blue, it is simply a
higher 
color temp of the light. Your Leica lens has all of the UV filtering 
built-in. You need to warm up the light, convert it back down to
5000-8000 
Kelvin (from roughly 12,000 Kelvin) color temp. Use a KR3.

Jim
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