- Reduces reflections and haze while improving color and tonal saturation for clearer, more natural images - 16-layer multi-coating with SH-PMC broadband coatings of 8 layers per side for maximum reflection control (below 0.2%) - Filter factor 2.3 to 2.8 (approx. +1.3 stops) to balance exposure in bright conditions - Uses high quality optical glass from the German Schott Group for brilliant color reproduction, best contrast and sharpness - Each side features a dust and moisture repellent top coating for easy cleaning and longer life - Slim mount design does not vignette with 21mm lenses - Matte black anodized brass filter rims minimize reflections and will not bind when threaded with other metals Use scenarios - Landscape photography with wide-angle lenses (including 21mm) to preserve edges and color without vignetting - Architecture and cityscapes where reflections on glass surfaces hinder clarity - Travel and street photography in bright light where color fidelity and contrast are important