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Re: Filter factors

>Marc James Small wrote:
>> Above 5,000 feet, a UV filter should be used with all films to reduce the
>> blue cast caused by lower air density.  See any of the Leica Manuals for a
>> discussion.

Above 7000 feet (parts of Santa Fe, NM) I am told that the bluish cast
buries images without haze/uv/skylight filtration. 

Gordon Cooper
Seattle, WA