Hoya 49mm LINEAR Polarizer PL Glass Lens Filter Authorized USA Dealer B-49PL-GB
- 49mm polarizing filter
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. Minimizes light reflections from glass and water Reduces glare from non-metallic surfaces. Provides a general color saturation to both cool and warm tones. Manufactured in self-rotating and drop-in formats. 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. 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!