ND64 & ND8 Filter Duo: This set includes a 4"x5.65" ND64 (6-stop) and ND8 (3-stop) filter, engineered for professional video and compatible with Tilta, SmallRig matte boxes It provides versatile exposure control from subtle to extreme light reduction, perfect for dynamic shooting conditions HD Optical Glass for 4K/8K Video: Crafted from imported HD optical glass with double-sided polishing, both filters ensure zero color shift and preserve sharpness corner to corner They meet the resolution demands of 4K, 6K and 8K video production 0.2% Reflectivity for Cleaner Footage: With ultra-low 0.2% reflectivity, they minimize internal reflections and flare from studio or outdoor lighting This delivers higher contrast, richer shadows and cleaner highlights for HDR and log-format video Durable & Easy-Maintain Coatings: Both sides of each filter feature nano-coating, making them scratch-resistant, waterproof, oil-proof and fingerprint-resistant The included leather pouch ensures safe storage and transport Compatibility & Usage Notes: Designed exclusively for matte box use, they work with lenses of any focal length when mounted A versatile exposure toolkit for DSLR, mirrorless and cinema cameras across various projects K&F CONCEPT is the world's No.1 brand in terms of lens filter online sales volume among camera-accessory-focused brands. Source: Euromonitor, 2024 data.