K&F Concept K&F 37MM XV40 Nano-X Variable ND Filter

Take full command of exposure with the K&F Concept 37mm Nano-X Variable ND8-ND128 Filter delivering 3 to 7 stops of adjustable neutral density without the dreaded X cross, even on wide-angle or telephoto lenses. Crafted from imported Japanese AGC optical glass, it ensures zero color cast, maximum sharpness, and true tonal balance. Advanced 28-layer nanometer coatings provide robust waterproof, scratch-resistant, and anti-glare protection while maintaining optical purity. The self-locking 7.4mm ultra-slim CNC aluminum frame eliminates vignetting down to 28mm focal length and offers non-slip grip for fast, secure installation. Perfect for video run-and-gun, long-exposure landscapes, or wide-aperture portraits in bright light; pair with a 40.5mm lens cap/hood. Verify your lens thread (ø37) before purchase.

Key Features

• Variable ND8ND128 (37 Stops) Smooth, stepless light reduction for motion blur or shallow depth.
• No X Cross Technology Self-lock frame prevents dark cross artifacts on wide/tele lenses.
• Japanese AGC Glass High-clarity, no color shift, edge-to-edge sharpness.
• 28-Layer Nano Coating Waterproof, anti-scratch, oil/dust repellent, minimal flare.
• Ultra-Slim 7.4mm CNC Frame No vignetting from 28mm; easy install/remove.
• 37mm Thread / 40.5mm Cap Size Fits all 37mm lenses; use 40.5mm accessories.