Howse Peak and Mt Cephren at Sunrise from Waterfowl Lake
I used a polarizer and a graduated neutral density filter to make this photograph. It was extremely cold on the fall morning when I shot this; well below freezing. When I was done shooting, I screwed my polarizer back on my stack of filters and put them in my pack.

Later in the day when the temperature was well above freezing, I set up for another shot. I tried to unscrew the polarizer from the stacker and discovered that it was impossible to separate. Fortunately, there was a patch of snow nearby. I refroze my filters and was able to then screw them apart with ease.

Now I never leave my stack of filters completely snug. When I replace a filter on the stack after using it, I screw it snug, and then back off half a turn.
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Ash Creek Images
Photographs of the West by Doug Gorsline

Sunrise on Howse Peak and Mt Cephren Reflects in Waterfowl Lake in Banff NP.
All materials on this site are copyright 1992-2007 by Doug Gorsline / ashcreekimages.com.
Please email me at douggorsline@comcast.net