Master Your Light: Unveiling the K&F Concept Nano-X Solid ND4 4x5.65 Matte box Filter

For the discerning, performance-inclined creator, the K&F Concept Nano-X Series Solid ND4 4x5.65” filter (model KF01.2454) stands as an indispensable tool for professional photography and cinema. This meticulously engineered rectangular glass filter integrates seamlessly with industry-standard 4x5.65-inch filter holders and matte box systems, offering a precise solution for managing light levels with minimal intervention. Its primary function is to reduce the light reaching your camera's sensor by a controlled 2 stops (ND4 density), allowing subtle exposure refinement without dramatically altering shooting conditions. Crafted with 28 layers of advanced nanometer coatings, it boasts an ultra-low reflectivity of just 0.2%, alongside robust anti-glaring, anti-scratch, waterproof, and dust-proof properties. With full support for 8K Ultra HD resolutions, this K&F Concept filter embodies our engineering DNA, delivering unwavering optical clarity, exceptional durability, and reliable performance to overcome common workflow bottlenecks, ensuring your creative vision is captured with pristine fidelity.

Precision Exposure Control with ND4 Density
Achieving precise exposure control, irrespective of ambient light, is fundamental to cinematic and photographic artistry. The K&F Concept Nano-X Solid ND4 filter provides this control by reducing the light entering your lens by 2 stops, allowing only 1/4 of the original light intensity (approximately 25% transmission) to reach your camera sensor. This mild attenuation is ideal for situations where lighting conditions are close to optimal, but slight exposure correction is required to maintain creative intent.

The ND4 density is particularly useful when working with fast lenses that tend to overexpose even in balanced lighting, or when fine-tuning shutter speed for natural motion rendering without significantly stopping down the aperture. It allows filmmakers to maintain consistent shutter angles and photographers to preserve preferred aperture settings while subtly preventing highlight clipping. This measured level of light reduction ensures exposure accuracy while remaining highly adaptable to changing light conditions, making the ND4 filter a practical choice for controlled environments, studio work, and lightly sunlit scenes.

Engineered for Seamless Professional Integration
Tailored for the rigorous demands of professional cinema and high-end photography, the K&F Concept Nano-X Solid ND4 filter adheres strictly to the industry-standard 4x5.65-inch size. This precise dimension guarantees immediate and effortless integration with virtually all professional matte box systems and dedicated filter holders, eliminating the need for cumbersome adapters. For creators in time-sensitive production environments, this standardisation is critical. The filter can be swiftly mounted and unmounted within popular matte box systems from manufacturers such as K&F Concept, ARRI, Bright Tangerine, or Tilta, preserving crucial setup speed on set. This focus on industry-standard compatibility reflects K&F Concept’s deep understanding of professional workflows, where reliability and interchangeability are paramount. Furthermore, in professional cinema, a solid ND filter like this ND4 is often preferred over variable ND alternatives when consistency and predictability are required. Solid filters eliminate potential issues such as uneven density or colour inconsistencies, ensuring reliable image quality across takes and setups.

Unrivalled Optical Clarity: The Nano-X Advantage
The exceptional performance of the K&F Concept Nano-X Solid ND4 filter stems from its advanced optical design, meticulously engineered for uncompromised image quality. Fabricated from premium optical glass, this filter guarantees superior light transmission and impeccable colour neutrality, forming a pristine foundation for your captured light. Central to its optical prowess are the 28 layers of state-of-the-art nanometer coatings. This multi-layering is a sophisticated engineering achievement, addressing the complex challenges of digital imaging. These coatings dramatically reduce light reflection off the filter surface to an ultra-low 0.2%, effectively suppressing glare, lens flares, and ghosting, even when shooting into reflective surfaces or controlled light sources. The result is cleaner, higher-contrast images and video while maintaining natural tonal transitions.

K&F Concept’s commitment to optical purity also guarantees the filter maintains complete colour accuracy, actively preventing colour casts or infrared contamination. Your footage will retain true-to-life colours, significantly reducing the need for extensive colour correction in post-production. Crucially, the Nano-X Solid ND4 filter fully supports video resolutions up to 8K Ultra HD. This forward-thinking design ensures that high-resolution productions benefit from maximum sharpness and detail without any degradation introduced by the filter.

Built to Endure: Rugged Protection for Any Environment
Understanding the dynamic and often demanding nature of professional production, K&F Concept has fortified the Nano-X Solid ND4 filter with a comprehensive suite of protective features for unparalleled durability. A hardened anti-scratch coating forms a vital defensive layer, safeguarding the precision optical glass from minor abrasions and scuffs inherent in regular handling on set or in the field. This significantly extends the filter's lifespan, ensuring its optical integrity remains pristine even after extensive use.

Complementing this scratch resistance are advanced waterproof and dust-proof properties. The nanometer coatings act as a protective barrier, causing water droplets to bead up and effortlessly roll off the surface, enabling easy cleaning and maintaining clear vision during light moisture exposure. Dust particles are similarly repelled, preventing them from adhering and interfering with image quality. This ensures consistent performance across a wide range of shooting environments, from studio setups to controlled outdoor locations.

Complete Package and Warranty
Your investment in the K&F Concept Nano-X Solid ND4 filter is thoughtfully protected and enhanced by a comprehensive package designed for immediate utility and long-term assurance. Included with your precision rectangular glass filter is a premium leatherette filter pouch. This dedicated storage solution is crucial for safeguarding your valuable optical glass from scratches, dust, and minor impacts during transport and storage. It ensures your filter remains pristine and ready for use, streamlining gear organisation and protecting its delicate coatings when not mounted on your camera system. K&F Concept unequivocally stands behind the quality and reliability of its engineering, which is why the Nano-X Solid ND4 filter comes with a comprehensive 24-month limited warranty. This two-year warranty covers manufacturing defects, providing robust protection for your investment and offering genuine peace of mind. Our commitment to you extends far beyond the point of purchase; it encompasses the entire lifespan of your product. This warranty, combined with the filter's easily cleanable design and robust construction, underscores our profound confidence in its longevity and consistent performance. Choose K&F Concept, and experience the unparalleled confidence that stems from owning gear developed by engineers, trusted by professionals, and supported by a brand genuinely invested in your creative journey.

Empower your creative vision and fine-tune exposure with the K&F Concept Nano-X Solid ND4 4x5.65 Mattbox Filter. Engineered for seamless professional workflows, offering uncompromised optical clarity, and built for lasting durability, this filter is an essential tool for filmmakers and photographers who require subtle, precise control over light without disrupting natural scene balance.

Frequently Asked Questions

Frequently Asked Questions:
Q: What does an ND4 filter density specifically mean for light transmission?
A: An ND4 filter reduces the light reaching your camera sensor by 2 stops, meaning it only allows 1/4th of the original light intensity to pass through. This translates to a light transmission of approximately 25%, providing mild exposure control for slightly bright conditions or subtle motion blur effects.

Q: How does this filter ensure colour accuracy and prevent colour shifts in professional productions?
A: The K&F Concept Nano-X Solid ND4 filter is engineered with high-quality optical glass and 28 layers of nanometer coatings, specifically designed to be colour neutral. This advanced coating process minimises infrared contamination and colour cast, ensuring your images and video footage retain true-to-life colours without requiring extensive post-production correction.

Q: What are the recommended cleaning methods to maintain the optimal performance of the nanometer coatings?
A: For best results, gently brush any loose dust off the filter with a soft, lint-free blower brush. Then, use a clean microfibre cloth designed for optics, along with a specialised lens cleaning solution. Wipe in a circular motion from the centre outwards. Avoid harsh chemicals or abrasive materials to preserve the integrity of the 28-layer nanometer coatings.

Q: Why might a fixed ND4 filter be preferred over a variable ND filter for professional cinema applications?
A: For professional cinema and photography, a solid ND filter like the ND4 offers superior optical consistency, eliminating potential X-pattern vignetting or colour shifts that can sometimes occur with variable ND filters at their maximum density. This ensures reliable, repeatable results and maintains image fidelity, which is crucial for high-stakes productions and seamless post-production workflows.

Q: Will using this ND4 filter introduce any noticeable loss of sharpness or resolution, especially when shooting 8K Ultra HD?
A: Absolutely not. The K&F Concept Nano-X Solid ND4 filter is crafted from premium optical glass with 28 layers of nanometer coatings and boasts an ultra-low reflectivity of 0.2%. These features collectively ensure that the filter maintains exceptional optical clarity and sharpness, fully supporting 8K Ultra HD video resolution without compromising image detail.

Technical Specifications:
• Product Type: Photographic Filter, Cinema Filter, Neutral Density Filter
• Series: Nano-X Series Filter (8k capture quality, 28-layer Nano Coatings, Scratch, Water and Dust resistant)
• Material: Glass
• Assembled Product Dimensions: 14.351 x 10.16 x 0.4 cm (L x W x H)
• Assembled Product Weight: 144 g
• Filter Density: ND4 (2 Stops)
• Coating Layers: 28 Nanometer Coatings
• Reflectivity: 0.2%
• Anti-glare: Yes
• Anti-scratch Coating: Yes
• Waterproof: Yes
• Dust Proof: Yes
• Max Video Resolution Support: 8K Ultra HD
• Frame Included: No
• Compatible Devices: 10.16 x 14.351 cm Filter Holder, Matte Box
• Easy Cleaning: Yes
• Warranty Period: 24 months
• Warranty Type: Limited