67mm Ultra-Low Reflectivity Variable ND Filter ND2-ND400 - Smooth

In this review the reviewer looks at the 67mm variable neutral density filter from K&F CONCEPT and finds it best for photographers and videographers who need precise exposure control without sacrificing image quality. The single biggest reason to buy is its ultra-low reflection technology combined with a marked, push-pull putter adjustment that makes stop selection quick and repeatable, so creative long exposures and controlled motion blur are easier to achieve in bright conditions.

Key Features

• Ultra-low Reflection Technology: Reflectivity reduced to about 0.1% cuts ghosting and flare when shooting backlit scenes for cleaner highlights and better contrast.
• High-Definition AGC Glass: Imported AGC optical glass is polished flat to preserve sharpness and deliver consistent, high-definition imaging across the frame.
• Putter Adjustment Frame: The push-pull lever design and clearly marked stops from ND2 to ND400 let users set precise exposures and rotate smoothly for varied compositions.
• 28 Multi-Layer Coatings: Nano-level multi-coating reduces reflections, adds water and scratch resistance, and improves durability and anti-smudge performance in the field.
• No Vignetting Design: A 7.4mm thin frame prevents vignetting in most lenses, with real-world use showing no vignetting beyond 19mm for stills and beyond 17mm for video.

Who It's For

The filter suits photographers and hobbyist videographers who shoot outdoors in bright light and need adjustable stops from ND2 to ND400 without swapping glass. Landscape shooters who want smooth long exposures and filmmakers who require precise aperture control will appreciate the marked stops and low-reflection coatings.

Those using very wide lenses under 17mm in video or under 19mm in stills should check for compatibility first, and studio photographers who rarely shoot in bright ambient light may not need a variable ND. Users seeking ultra-compact or very low-cost disposable solutions should look elsewhere.

Pros & Cons

Pros

• Very low reflectivity reduces ghosting and preserves contrast in backlit situations.
• Flat AGC glass maintains image sharpness and delivers high-definition results.
• Putter-style adjustment with clearly marked stops allows repeatable exposure settings for video and photo workflows.
• Durable multi-coatings add water and scratch resistance for field use.

Cons

• Variable NDs can introduce color shifts at extreme settings, so users may need to correct color in post.
• Very wide-angle setups below the noted focal ranges should be tested for vignetting before critical shoots.

Specifications

Filter Diameter	67mm
Density Range	ND2 to ND400 (1-9 stops)
Glass Type	Imported AGC optical glass
Coatings	28 multi-layer nano coatings (waterproof, scratch-resistant)
Frame Design	Push-pull putter with marked stops and 360-degree rotation
Frame Thickness	7.4mm (no vignetting beyond 19mm stills / 17mm video)

Our Verdict

The K&F CONCEPT 67mm variable ND is a practical, high-value tool for outdoor photographers and videographers who need flexible exposure control with minimal flare. Its ultra-low reflectivity, flat AGC glass and durable multi-coatings make it a reliable choice for landscape and motion work, while the putter adjustment gives accurate, repeatable stops. It is recommended for most users shooting at moderate focal lengths who want predictable ND performance.

Frequently Asked Questions

Will this filter cause vignetting on wide lenses?
The 7.4mm thin frame is designed to avoid vignetting; tests show no vignetting beyond about 19mm for stills and 17mm for video, but very wide lenses should be tested on your camera.

Does the filter affect sharpness?
No, the polished AGC optical glass preserves a flat surface to maintain sharpness and high-definition image quality when used correctly.

How do you set exact stops?
The push-pull putter frame has clearly marked stops from ND2 to ND400 and allows smooth 360-degree rotation so users can select and repeat precise exposure settings.