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(More customer reviews)This is a proper polarizing filter. It has a marking line on the forward (rotating) half of the filter, so you can keep track of the angle. Rotating the forward half is what changes the shadows reflecting off of the subject. It is also a true circular polarizing filter (I verified this myself). This is necessary for use with the autofocus systems of SLRs and Bayer filters over the sensors of DSLRs.
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Light rays which are reflected by any surface become polarised and polarising filters are used to select which light rays enter your camara lens.They allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc.They also saturate colors and increase contrast.Polarizers come in two variations but have the same effect. Linear polarizers work with older camera meters; Circurlar polarizers are designed for today's newer split-beam metering systems used in auto focus cameras. Check your camera's manual.
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