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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 camera lens. PL (Linear Polarising) and PL-CIR (Circular Polarising) filters have the same effect, but it is important you choose the correct version for your camera¹. They allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. They also eneable colours to become more saturated and appear clearer, with better contrat. This effect is often used to increase the contrast and saturation in blue skies and white cloud. HOYA Polarising filters do not affect the overall balance of a shot.
¹Many of todays cameras use semi-silvered mirrors or prisms to split the light entering the viewfinder in order to calculate exposure and focusing distance. PL filters sometimes interact with these items to give unpredictable exposure or focusing. It is therefore recommended that you choose a PL-CIR filter unless you have a manual focus camera which has no beam splitter.
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Filter - Factors & F-stops
f-stop = 1.2/3 to 2, Filter Factor = 3 to 4,
Filter - Coating
Standard
Filter - Type of Effect
Linear Polarising
Filter - Fitting Type
Screw In
Filter - Thread Size
46mm