high altitude color

Discussion in 'Miscellaneous Equipment' started by brianentz, Sep 18, 2012.

  1. brianentz

    brianentz Member

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    Joined:
    Jul 28, 2011
    Shooter:
    35mm
    Seems to me that the film I shoot at high altitudes (10,000 feet plus) give me more trouble in trying to get the color right than the film I shoot much lower. I just processed a bunch of film at shot at close to sea level and it scanned like a dream. Just got back from high in the sierra's and I just can't get the color right. Any ideas?
    I'm shooting velvia and ektar.
     
  2. Gerald C Koch

    Gerald C Koch Member

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    Jul 12, 2010
    Location:
    Southern USA
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    Multi Format
    At higher altitudes there is more light from the shorter wave part of the spectrum. This means more blue, violet and ultra-violet. In other words the color temperature of the light is higher than at sealevel. Average color temperature at sealevel is ~5600K while at higher altitudes it can be 10,000K or higher.

    Try using a Wratten 1A (skylight) filter first and if this does not provide enough correction then try a Wratten 2A filter. There is a similar problem on overcast days. On gray, dreary days I use a Color Correcting filter such as a CC 05R (red) or CC 05M (magenta) filter to warm things up a bit. You will have to do some experimenting as to which filter provides the best results for you. Here is a list of the Wratten filters. http://en.wikipedia.org/wiki/Wratten_number

    Each color film has its own spectral response. Perhaps a different film might work better. Some emphasize cooler tones while others warmer ones.

    The color temperature of daylight is effected by several factors such a the position of the sun. Thus the color temperature is highest just before sunrise. I would suggest that anyone who is a serious color photographer read up on this subject.
     
    Last edited by a moderator: Sep 18, 2012