Hoya B46CIRPLGB 46mm Warm Circular Polarizer Filter

The Hoya B46CIRPLGB 46mm Warm Circular Polarizer Filter is a dual-purpose optical filter that combines a circular polarizer with an 81A warming filter in a single piece of glass. The polarizing element works like any quality circular polarizer — rotate the outer ring to reduce or eliminate reflections from water, glass, and non-metallic surfaces, while simultaneously deepening blue skies and boosting overall color saturation. What sets this filter apart is the integrated 81A warming layer, which adds a subtle amber tone to counteract the bluish cast that often appears when shooting in open shade, overcast skies, or at high altitudes.

By combining both effects in one filter, the Hoya Warm Polarizer eliminates the need to stack a separate warming filter on top of a polarizer, which can introduce vignetting on wider lenses and degrade image quality. The circular polarizer design ensures full compatibility with autofocus systems and through-the-lens metering found in modern SLR and mirrorless cameras. The 46mm thread size is suited for compact lenses commonly found on mirrorless systems and some older SLR optics. Photographers who frequently shoot landscapes, outdoor portraits, or travel scenes in variable lighting will find this filter a practical way to improve color rendition and reduce haze in a single, convenient attachment.