K&F Concept Push in Fit ND2-32, CPL & Diffusion Filter Set - Action

In this review of the K&F Concept push in fit filter set for DJI Osmo Action series, the bottom line is simple: this kit is for action camera shooters who want quick on-camera exposure control and creative looks without fuss. The three-piece set (ND2-32 variable ND, circular polarizer, and black diffusion 1/4) installs instantly with the push in fit and uses multicoated AGC optical glass, so its single biggest selling point is fast, reliable control over motion blur, glare and softness during movement-heavy outdoor shooting.

Key Features

• Instant Push In Fit: Fast installation and removal saves time on the trail or in the waves so you can change filters mid-activity without tools.
• Variable ND2-32: Reduces shutter speed across 1 to 5 stops to create pleasing motion blur during skiing, mountain biking, surfing or other first-person action.
• Black Diffusion 1/4: Adds a soft halo and lowers contrast for a cinematic, dreamy look that flatters faces and smooths highlights in landscape scenes.
• Circular Polarizer (CPL): Cuts reflections and boosts saturation on water, foliage and glass to reveal more detail and richer color in outdoor shots.
• Multi-coated AGC Optical Glass: Double-sided 28-layer nano coating improves clarity, reduces reflections and resists water and scratches for reliable field use.

Who It's For

This kit is aimed at vloggers, action sports athletes and outdoor filmmakers using DJI Osmo Action 5 Pro, Action 4 or Action 3 cameras who need quick, dependable filter changes and want to control exposure, glare and image texture without bulky adapters. It works well for people shooting skiing, surfing, mountain biking, climbing or travel vlogs where speed and convenience matter.

Photographers seeking precision cinema glass or studio work should look elsewhere, since this set is targeted at practical, on-camera creativity rather than professional cine optics; likewise, those who need extreme ND density beyond 5 stops will need a different solution.

Pros & Cons

Pros

• High perceived build and optical quality praised by customers and supported by AGC glass and nano coatings.
• Push in fit design is quick and reliable, ideal for action use where rapid swaps are necessary.
• Versatile trio: variable ND for motion blur, CPL for reflections, and diffusion for cinematic softening.

Cons

• The ND2-32 range covers 1 to 5 stops, which is useful for many conditions but may not be enough for very bright daylight situations requiring heavier stops.
• Some users report mixed impressions on image quality or functionality in certain lighting, so expectations should be realistic for action-camera workflows.

Specifications

Compatibility	DJI Osmo Action 5 Pro, Action 4, Action 3
Included Filters	Variable ND2-32, CPL, Black Diffusion 1/4
Glass Type	AGC optical glass
Coating	Double-sided 28-layer nano multi-coating
Primary Uses	Skiing, surfing, mountain biking, climbing, travel vlogging
Fit Style	Instant push in fit

Our Verdict

The K&F Concept push in fit filter trio is a practical, good-value kit for action-camera shooters who want quick exposure control, reduced glare and a cinematic diffusion option in a compact package. It stands out for convenience and optical coatings, making it a smart choice for outdoor vloggers and sports filmmakers who prioritize speed and creative variety over extreme ND densities.

Frequently Asked Questions

Will these filters fit my Osmo Action camera?
Yes, the set is designed specifically to be compatible with DJI Osmo Action 5 Pro, Action 4 and Action 3 models.

How much light does the ND2-32 block?
The ND2-32 variable filter covers approximately 1 to 5 stops of light reduction for flexible outdoor exposure control.

Does the diffusion filter affect sharpness?
The black diffusion 1/4 softens highlights and reduces contrast to create a dreamy, cinematic look while keeping overall scene detail usable for video.