Optical Filter
A CPL (CircularPolarizer/Circular-Polarizing Filter) produces circularly polarized light forward and tests it in reverse. It reduces polarized reflections, increases saturation/deepens blue skies and highlights clouds, suppresses glass/water reflections and reduces atmospheric-haze softness without changing overall color balance. The source lists linear-polarizer labels L—PL (UnearPolaxizer), PL——L (PolarizingF、ilter——Linear), PlLineat, PL, POL and CPL. The two-piece structure screws onto the lens at the rear while the front rotates; angle affects metering/saturation, with strongest effect generally at90° to illumination. Exposure typically drops two stops. Avoid it when water reflections or metallic highlights are desired; it suits fish/algae underwater or shop-window displays. Portrait use removes facial highlights and reduces contrast for a flatter look. Adjustment occupies one hand, so a tripod/cable release helps. Reduced harmful reflections improve clarity/expression and enrich sky, foliage, ridges and building colors. Circular CPL is intended for AF/digital cameras and also works with MF bodies.
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