Product Description
Moose Filter-Warming Circular Polarizer
Collaboration between respected wildlife photographer and conservationist B.
Moose Peterson of Wildlife Research Photography and THK Photo Products, Inc.,
has created a circular polarizing filter that uses 81A optical glass made by
Hoya, the worlds largest optical glass manufacturer, instead of the clear
optical glass of a normal circular polarizer.
When using a camera with a split beam metering system (a metering system that
employs a polarized half mirror) which is most of todays auto focus camera
bodies, traditional linear polarizers will cause exposure errors do to their
light absorption properties. Circular polarizers yield the same optical effect
while not causing exposure problems with modern metering systems. For many
years, polarizers have been used to remove reflections from non-metallic
surfaces such as water and glass as well as being used to darken blue skies to
increase contrast in scenic photography.
A side effect of both linear and circular polarizes is they cool down or make
the over-all color balance of a scene slightly bluish. The addition of the 81A
glass corrects the color temperature, bringing the scene back to the original
5500K for daylight films color balance. The 81A glass creates a much more
pleasing and warm color balance to the entire scene while the circular
polarizer increases color contrast and reduces the effect of atmospheric haze.
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