K&F Concept ND8-ND2000 Variable ND Filter 77mm, 3-11 Stops, 28-Layer Multi-Coated, Ultra-Slim Aluminum Frame

For photographers who demand precise exposure control without swapping filters, the K&F Concept ND8-ND2000 variable neutral density filter delivers an impressive 3 to 11 stops of light reduction in a single 77mm ring. Its Japanese AGC optical glass and 28-layer multi-coating keep colours neutral and details crisp, while the ultra-slim aviation aluminum frame prevents vignetting on wide-angle lenses. This filter turns bright scenes into creative opportunities—from silky waterfalls to cinematic motion blur.

Highlights

• Variable ND range: ND8 to ND2000 (0.9 to 3.3 optical density), covering 3 to 11 f-stops
• Premium Japanese AGC optical glass with 28-layer multi-coating for excellent colour neutrality and minimal flare
• Water-repellent, oil-proof, anti-scratch, and anti-reflective coating for durability and easy cleaning
• Ultra-slim aviation aluminum frame with double threading—accepts 77mm lens caps and hoods
• Smooth rotation with hard stops at both ends to prevent the 'X' cross effect at maximum density

In daily use

Mount the filter on any lens with a 77mm thread and rotate the ring to dial in the exact exposure you need. At ND8 you can shoot wide open in bright sunlight for shallow depth of field; at ND2000 you can stretch shutter speeds to seconds for long-exposure landscapes or smooth water. The hard stops let you find minimum and maximum quickly without looking, and the front thread keeps your lens cap or hood in place. The multi-coating resists fingerprints and water spots, so you spend less time cleaning and more time shooting.

Full specifications

• Filter type: Variable neutral density (VND)
• ND stop range: ND8 to ND2000 (3 to 11 stops)
• Filter diameter: 77mm
• Optical material: Japanese AGC optical glass
• Coating: 28-layer multi-coating (water-repellent, oil-proof, anti-scratch, anti-reflective)
• Frame material: Aviation aluminum alloy
• Frame type: Ultra-slim
• Light reduction: 3 to 11 f-stops
• Optical density: ND 0.9 to ND 3.3
• Special feature: No 'X' cross effect at maximum ND
• Colour neutrality: Excellent (minimal colour cast)
• Rotation mechanism: Smooth with hard stops for min/max
• Thread type: Double-threaded (front thread for lens cap/hood)
• Compatibility: Lenses with 77mm filter thread
• Applications: Long exposure photography, motion blur, aperture control in bright light, videography

Final note

One filter replaces a whole set of fixed NDs—compact, precise, and built to last. The K&F Concept SB6581 is a reliable tool for any photographer who values creative control in changing light.