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