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David R. Busse wrote: > color > temps are hotter at high elevations, This means closer to 5500K (bluer) at higher elevations, and closer to 5000K (warmer, or more orange looking) closer to sea level. > and that shooting with a warming > filter...an 81, I believe...keeps shadows from going blue under these > conditions. > > Never heard this before but it makes sense to me. There is more UV (blue) light getting through the atmosphere at higher elevations, so the color temperature of the sunlight you work with up there is 'cooler', or bluer, and this shows up on film (I like it though most of the time). This can be corrected to a degree with the use of a UV filter (THAT'S what those things are really meant for!) which will cut off that excess blue light over about 270nm (nonometers). A warming filter can do similar looking things, but warming filters work by changing the color cast recorded on film, not by cutting out blue UV light. A warming filter in the mountains is technically too much, unless you are more used to the color of the sky (more haze and pollutants) closer to sea level. The sky really is blue out in the country on a clear day! Dave Dave Cohen Photographer Action Photographic Webmaster [EMAIL PROTECTED] http://www.anet-stl.com/acphotog/home/ ======================================================= -> SPORRS: 'Serious Photographers Of Railroad Related Subjects' -> Web Site: http://www.anet-stl.com/acphotog/sporrs/ -> Message © 1998 SPORRS® - All Rights Reserved =======================================================
