Moose's (as in Moose warming filters, not our resident moose) on 81a.
http://www.moose395.net/gear/81a.html
Perhaps most of you are familiar with this, but I never really understood it
in a technical sense until I found and read this article earlier today.
Someone on this list steered me toward using an 81a for color problems at
high altitiudes. So on that reccomendation, when I was in Bolivia last
month, at mostly altitudes between 8500 and 12,000 feet, I used an 81a
filter (81b on the 35RC) on all my lenses all the time (except for the
vivitar 17mm, for which I didn't have one to fit). I've been there five
times previously, and this is the first time I've been able to get good
results. I knew it worked for me, but not until today did I really
understand it.
Wayne
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