Hoya 55mm LINEAR Polarizer PL Glass Lens Filter Authorized USA Dealer B-55PL-GB
Linear Polarizers are used with most video and manual focus photo cameras. They are not recommended for auto-focus SLR cameras or cameras equiped with a beam splitting metering system.
Linear Vs. Circular Polarizers
There are two types of polarizing filters available — linear or circular. Linear polarizers are more effective and less expensive than circular ones. But circular polarizers are needed with just about any camera that has a BEAM-SPLITTING METERING SYSTEM, or AUTOFOCUS. The reason for this is that both of these systems use semi-silvered mirrors to siphon off some of the light coming through the lens. If that light is linearly polarized it renders either the metering or the autofocus ineffective.
Produces deeper colored blue skies, which at the same time creates a striking contrast with white clouds. Minimizes light reflections from glass and water Reduces glare from non-metallic surfaces. Provides a general color saturation to both cool and warm tones. Can be used in extremely bright light situations to reduce the amount of light entering the camera; this enables more selective depth of field control. Manufactured in self-rotating and drop-in formats.
Note: using a Linear Polarizer on an auto focus camera with a beam-splitting meter will result in under-exposure of approximately 2-3 f:stops. Light is polarized by both the filter and the beam-splitting meter which results in double polarization. However, Linear Polarizers can be used with both non-auto focus and auto focus video cameras.
Provides the same filter effects as a Linear Polarizer, but is designed to work with auto focus cameras with beam splitting metering. The Circular Polarizer has linear polarizer construction plus a built-in 'Wave Retardant' to ensure proper exposure. The linear element polarizes the light, and the wave retardant de-polarizes it, and then the beam-splitting meter polarizes the light again for proper exposure. The use of a Linear Polarizer with a beam-splitting meter will result in underexposure. Also used in video for video assist. (video tap).
Most modern SLR cameras use a polarizing half mirror (split beam metering) system and are designed to be used with a Circular Polarizer. If you own a modern SLR this filter will not work properly with your cameras metering system!!!
WE WOULD STRONGLY SUGGEST REVIEWING YOUR CAMERAS MANUAL TO VERIFY WHETHER A LINEAR POLARIZER WILL WORK WITH YOUR CAMERA!
Sorry to be so redundant with this but we want to make sure that you are ordering the correct Polarizer!