K&F Concept filter Black Diffusion 1/4, 55mm

The K&F Concept Black Diffusion 1/4 Filter is a premium optical accessory designed for photographers and videographers seeking to achieve a cinematic, dreamy look. Crafted with Japanese AGC optical glass and an aviation aluminum alloy frame, this filter softens skin tones, reduces blemishes, lowers contrast, and adds a subtle glow to highlights, making it ideal for portraits, weddings, landscapes, and video production.

Advantages

With 28-layer nano coatings, the filter offers water resistance, scratch resistance, anti-reflection, and anti-oil/fingerprint properties. Its ultra-slim 4.9mm frame minimizes vignetting, even on wide-angle lenses, while the double-threaded design allows for easy stacking with other filters. The 1/4 stop diffusion effect provides a balanced softening without overexposure, preserving image detail.

Suitable for

• Portrait and wedding photography
• Landscape and travel photography
• Cinematic video production
• Lenses with 55mm filter thread

Key specifications

• Filter Type: Black Diffusion
• Filter Strength: 1/4 Stop
• Filter Diameter: 55mm
• Optical Material: Japanese AGC Optical Glass
• Frame Material: Aviation Aluminum Alloy
• Coatings: 28-Layer Nano Coatings
• Light Transmission: 84%
• Frame Thickness: 4.9mm
• Density: 0.15 ND

Recommendations

For best results, pair this filter with a lens hood to reduce flare and protect the glass. Clean with a microfiber cloth to maintain the hydrophobic and oleophobic coatings.