Schneider 138mm Linear True-Pol Polarizer Filter

The Schneider 138mm Unmounted True-Pol Linear Polarizer Filter from Lightbulb Rentals is designed to effectively reduce reflections and glare caused by polarized light from non-metallic surfaces. When sunlight reflects off these surfaces, it becomes polarized and scattered, leading to visible haze. The polarizer filters this directional polarization perpendicularly, thereby absorbing much of the scattered light. This results in reduced glare and reflections, while enhancing the saturation of skies and foliage in photography.
Unlike circular polarizers, the linear polarizer does not include an additional quarter wave plane. This difference means that it does not circularly polarize the light, which is necessary for certain auto focus and exposure functions in cameras. As a result, using a linear polarizer may affect the accuracy of these functions. It is recommended for situations where in-camera exposure metering or autofocus is not critical.
This filter is constructed from Water White optical glass, providing approximately 33% average light transmission. It is unmounted for compatibility with third-party or custom filter holders used with film and television cameras. The True-Pol Linear Polarizer is most effective when used at a 90° angle from the sun and delivers a 2.97x filter factor, reducing exposure by approximately 1.57 stops.