Archived posting to the Leica Users Group, 2001/02/19

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Subject: Re: [Leica] photography at altitude
From: "Henning J. Wulff" <henningw@archiphoto.com>
Date: Mon, 19 Feb 2001 09:00:36 -0800
References: <20010216232646.15CDC6E04@smtpgate.gannett.com> <3A902549.DFEC02D1@rabiner.cncoffice.com>

At 11:40 AM -0800 2/18/01, Mark Rabiner wrote:
>  ><Snip>
>Up there where the sky is purple there is a lot of UV!!
>I recall a friend shooting some skiwear fashion and using an 81C! filter.
>When he saw his take he then wished he'd used an 81D filter!
>Would a modern color temperature meter work up there? Measure the 
>cooling effect
>of the UV?
>
>mark rabiner

For actual color, ie cooling and warming and magenta<->cyan the 
Minolta color meter does fine. However, with respect to UV induced 
color shifts, no meter can be generally accurate as various film's 
response is not standardized, and various manufacturer's lenses 
transmit UV to various degrees. I know from my own experience that 
while Leica lenses of the last 30 years do not transmit UV to any 
noticeable degree, many Nikon lenses do. So you may find that you get 
a slight veiling blue flare using some Nikon lenses at high altitudes 
(high UV level conditions).

Of course, the main color issue is that the sky is a lot deeper blue 
when clear than at sea level, and if there is snow on the ground you 
get all that blue reflected off the snow again, so an 81C or 81D 
might be desirable. Remember that if you use any filter made in the 
last 40 years, you don't need a UV filter as well, as all filters 
have the UV cut built in.

If you think having a UV filter on your lens when you don't need it 
is silly, just think of all the people with 28-200 f/5.6 zooms who 
shoot at all times with a polarizer _and_ UV filter on their lens! 
Camera shake, flare and vignetting, all in one!



- -- 
    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  /###\   mailto:henningw@archiphoto.com
  |[ ]|     http://www.archiphoto.com

In reply to: Message from "Zeissler, Mitch" <mzeissle@gcipoa.gannett.com> (RE: [Leica] photography at altitude)
Message from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] photography at altitude)