MINT Moose's Warm PL CIR. Circular Polarizer 77mm Filter

MINT Moose's Warm PL CIR. Circular Polarizer 77mm Filter 
Never been used.
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