K&F Concept Neutral Density Filter


Product Specification:
– Brand: K&F Concept
– Filter Type: Neutral Density (ND) Filter
– Filter Size: 40.5mm
– Filter Density Range: ND2 to ND400
– Material: Imported Optical Glass (not Optical Resin)
– Design: Professional Ultra-Slim Design
– Compatibility: Compatible with all 40.5mm lenses
– Package Includes: Adjustable Neutral Density Professional ND Lens Filter ND2-400, Microfiber Lens Cleaning Cloth
– Additional Information: The filter is made by a professional team under the K&F Concept brand. The package may be either the new or old version, sent randomly.

K&F Concept 40.5mm Neutral Density Filter, 40.5mm Slim Variable Fader ND Filter Adjustable ND2 to ND400 Filter + Cleaning Cloth
  • 【Import Optical Glass】Crafted from premium AGC optical glass with 8 multi-layer coatings, this ND filter reduces reflections and glare, ensuring...
  • 【Versatile Light Control】With 1 to 9 stops of adjustable light reduction and 360-degree rotation for precise dimming settings, this filter is...
  • 【Glare-Free Surface】Treated with an oxidized sandblasting process, this filter prevents unwanted stray light and minimizes unnecessary reflections...
  • 【Slim and Secure】At a mere 7.4mm thickness, the CNC-patterned design ensures enhanced friction while rotating, making it easy to attach/detach...
  • 【Compatibility Note】This ND filter suits all 40.5mm lenses. Check your camera's lens thread size (usually beside a "ø" diameter symbol) before...

Editor’s Review


The K&F Concept 40.5mm Neutral Density Filter is a versatile tool for photographers looking to enhance their creative potential. This adjustable filter is designed to fit all 40.5mm lenses and offers a range of ND2 to ND400 settings. With a professional ultra-slim design and imported optical glass construction, this filter is a valuable addition to any photographer’s gear. In this review, we’ll take a closer look at the features and performance of the K&F Concept 40.5mm Neutral Density Filter.

Imported Optical Glass

One of the standout features of the K&F Concept 40.5mm Neutral Density Filter is its use of professional optical glass instead of optical resin. This ensures superior image quality and clarity, allowing photographers to capture stunning shots with minimal distortion. The use of optical glass also enhances the durability of the filter, making it resistant to scratches and other damage. This ultimately translates to a longer lifespan and better value for money.

Variable ND Filter

The K&F Concept 40.5mm Neutral Density Filter is a variable ND filter, allowing photographers to easily adjust the amount of light that enters the lens. With a range of ND2 to ND400 settings, users have full control over the exposure and can achieve a wide range of creative effects. This makes it an ideal tool for landscape, portrait, and long exposure photography. The smooth rotation mechanism ensures precise adjustments, allowing for seamless transition between different lighting conditions.

Professional Ultra-Slim Design

The ultra-slim design of the K&F Concept 40.5mm Neutral Density Filter is another standout feature. This design not only adds to the aesthetic appeal but also eliminates the risk of vignetting, even when used with wide-angle or telephoto lenses. The slim profile also means less weight and bulk, making it convenient to carry and use in various shooting scenarios. Whether you’re a professional photographer or an amateur enthusiast, this filter’s design ensures ease of use and compatibility with a wide range of lenses.

Package Includes

The K&F Concept 40.5mm Neutral Density Filter comes bundled with a professional microfiber lens cleaning cloth. This cloth is incredibly soft and easy to use, allowing photographers to keep their lenses, filters, glasses, and mobile devices clean. The high-quality of the cleaning cloth ensures that no scratches or streaks are left behind when used. This adds further value to the overall package and ensures that users have the necessary tools to maintain the filter’s performance.


It’s important to note that the K&F Concept 40.5mm Neutral Density Filter is compatible with all 40.5mm lenses. Before purchasing, it’s recommended to verify your camera’s lens size by locating the number beside the “√∏” symbol, which represents the diameter of the lens. This filter is designed to fit perfectly with 40.5mm lenses, ensuring a secure and precise connection. The versatility in compatibility allows photographers to switch between different lenses without any hassle.

K&F Concept Brand

The K&F Concept brand is highly regarded in the photography industry for its commitment to quality and innovation. The 40.5mm Neutral Density Filter is no exception, as it’s manufactured by a professional team of experts. With years of experience and a focus on meeting the needs of photographers, K&F Concept consistently delivers products that exceed expectations. The brand’s dedication to customer satisfaction is evident in the attention to detail and thoughtful design of the 40.5mm Neutral Density Filter.

New and Old Package

It’s worth noting that both new and old packaging may be sent randomly when purchasing the K&F Concept 40.5mm Neutral Density Filter. While this may not have any impact on the filter’s performance, some users may prefer one package over the other. However, regardless of the packaging, the filter’s quality and features remain the same. Therefore, it’s important to focus on the filter itself rather than the packaging when evaluating its performance and value.


In conclusion, the K&F Concept 40.5mm Neutral Density Filter is a high-quality and versatile tool for photographers. With its imported optical glass construction, variable ND range, and professional ultra-slim design, it offers excellent image quality, creative control, and compatibility with a wide range of lenses. The bundled microfiber cleaning cloth adds further value, ensuring that the filter remains in optimal condition. Whether you’re a professional or an enthusiast, the K&F Concept 40.5mm Neutral Density Filter is a valuable addition to your photography gear.

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