K&F Variable ND Filter ND2-ND400 37mm Clip-On for Smartphone

The K&F Variable Neutral Density Filter ND2-ND400 is a versatile clip-on filter designed for smartphone photography. It allows precise control over light exposure, enabling long exposure shots, motion blur effects, and smooth video recording even in bright conditions. The filter features a 37mm diameter, HD optical glass with 28-layer multi-resistant coating, and a durable aviation aluminum alloy frame. Its universal clip fits most smartphones, making it an essential tool for mobile photographers.

Advantages

This variable ND filter offers seamless adjustment from ND2 to ND400 (1 to 8.6 stops), eliminating the need to carry multiple filters. The 28-layer coating ensures waterproof, scratch-resistant, and oil-proof performance, while the double-sided polishing technology maintains color fidelity without color cast. The smooth rotation mechanism allows quick density changes, perfect for capturing motion blur or reducing shutter speed in bright light.

Suitable for

• Smartphone photographers seeking professional-grade light control
• Long exposure photography (waterfalls, clouds, traffic trails)
• Video recording with cinematic motion blur
• Bright outdoor conditions where overexposure is a concern

Key specifications

• Filter Type: Variable Neutral Density (VND)
• ND Range: ND2 - ND400 (1-8.6 stops)
• Filter Diameter: 37mm
• Optical Material: HD Optical Glass
• Coatings: 28-Layer Multi-Resistant Coating (MRC)
• Frame Material: Aviation Aluminum Alloy
• Clip Material: ABS + Aluminum Alloy
• Compatibility: Universal for Smartphones (iPhone, Samsung, Huawei, etc.)
• Mounting Method: Clip-on
• Color: Black Frame, Grey Glass
• Special Features: Waterproof, Scratch-Resistant, Oil-Proof, Anti-Reflection
• Application: Long Exposure, Motion Blur, Video, Bright Light
• Adjustability: Smooth Rotation for Density Control
• Included Accessories: Variable ND Filter, Universal Clip, Storage Case, Cleaning Cloth

Recommendations

For best results, use the filter in well-lit conditions and adjust the density ring smoothly to avoid sudden exposure changes. Clean the glass with the included cloth to maintain optical clarity. Compatible with most smartphone camera setups; ensure your phone has a flat surface for the clip to attach securely.