The bright version for professionals. With these high-end polarising filters, the polarising film is more closely specified and the film pieces are specially selected. After cementing between high-quality cover glasses, an additional grinding and polishing process takes place. This ensures outstanding sharpness even with very bright, apochromatic lenses. Latest cementing technology ensures long-term stability even in humid climates. The new generation of Käsemann High Transmission (HTC) polarising filter is designed with a new polarising film that has a higher light transmission (transmission) and still provides excellent efficiency. The filter extension factor is only 2-3, which is approx. 1-1.5 aperture stops.