The B+W 105MM TOP-POL F-Pro Polarizing Filter Lens in Case is a premium circular polarizer designed for professional photographers and videographers using large telephoto lenses with 105mm front filter threads. This filter reduces reflections and glare from non-metallic surfaces such as water, glass, and glossy paint while simultaneously increasing color saturation, particularly in blue skies and foliage, resulting in richer, more vibrant images straight from the camera. The rotating mount allows users to adjust the polarization effect visibly through the viewfinder or on the camera's display screen, providing precise control over the final image.

The filter employs B+W's advanced MRC (Multi-Resistant Coating) technology, which applies 7 to 16 layers of anti-reflection coating on each glass surface, achieving over 99.5 percent light transmission while repelling water, resisting scratches, and reducing internal ghosting and flare. Constructed from precision Schott optical glass, the filter maintains exceptional optical clarity and color fidelity without introducing unwanted color casts. The F-Pro brass filter ring prevents jamming and binding on lens threads while providing superior strength and durability for professional use. The filter is edge-sealed to protect the internal Kaesemann polarizing foils against humidity and environmental exposure, ensuring long-term reliability.

This circular polarizer is specifically compatible with modern DSLR and mirrorless cameras featuring through-the-lens autofocus and metering systems. Unlike linear polarizers, the circular design incorporates a quarter-wave plane that prevents interference with camera exposure sensors and autofocus systems. The polarization effect is most intense when the camera is positioned at a 90-degree angle to the sun, with a typical filter factor of 2 to 2.8x (1 to 1.5 stops of light loss). The included plastic storage case provides safe transport and protection when the filter is not in use. The BASIC line represents B+W's universal polarizing filter series with high optical quality and optimized knurling for easy attachment and rotation.