K&F Concept Push in Fit Variable ND Filter Set - Smooth Motion Blur

In this review the K&F Concept push in fit variable ND filter set is evaluated for action-camera users who need quick exposure control while shooting fast outdoor sports. The bottom line: this kit is for DJI Osmo Action 5 Pro/Action 4/Action 3 owners who want a compact, durable way to add motion blur and protect the lens without fiddly adapters. The most convincing reason to buy is the instant push-in fit combined with two useful stop ranges that let a shooter tame bright scenes and create silky water or light trails on the fly.

Key Features

• Compatibility: Designed specifically for DJI Osmo Action 5 Pro/Action 4/Action 3, the filters mount directly for a fast, tool-free workflow.
• Two VND Ranges: The kit includes ND2-32 for 1-5 stops and ND32-512 for 6-9 stops, giving versatile exposure control across medium to very strong light conditions.
• Multi-coated Optics: The 28 multi-layer coatings reduce glare and flares while resisting water, oil and scratches to preserve image clarity outdoors.
• Imported AGC Glass: Made from AGC optical glass to maintain color fidelity and minimize image degradation when shooting action footage.
• Push In Fit: The instant snap-on design installs without removing the protective filter so you can change filtration quickly during a session.

Who It's For

The kit is best for first-person-view action shooters who use a compatible DJI Action camera and need fast, reliable neutral density control while skiing, surfing, mountain biking or climbing. It suits videographers who want to reduce shutter speed to add motion blur and a stronger sense of speed to dynamic footage.

Those shooting mainly in low light, or who require variable polarizing control rather than density, should consider other specialized accessories. Also, users of non-compatible action cameras should look for a model made for their mount system.

Pros & Cons

Pros

• Good fit and secure snap-on attachment that preserves the camera's protective lens element.
• Wide VND coverage with two filters for flexible exposure control from 1 to 9 stops.
• Durable multi-coated AGC glass that reduces flare and protects the lens from water and scratches.

Cons

• Image quality and functionality received mixed feedback from some users, so expect small differences depending on shooting conditions and technique.

Specifications

Our Verdict

The K&F Concept variable ND set is a practical, value-oriented option for Osmo Action users who need quick, reliable ND control and lens protection while shooting outdoors. With two complementary stop ranges and durable multi-coated AGC glass, it delivers noticeable motion blur and protection without slowing a shoot, making it a sensible buy for most action videographers.

Frequently Asked Questions

Will these filters fit my Action 5 Pro?
Yes, they are specifically made to snap onto DJI Osmo Action 5 Pro, plus Action 4 and Action 3 models.

What stop ranges are covered?
The kit includes ND2-32 covering about 1-5 stops and ND32-512 covering about 6-9 stops for a wide range of light conditions.

Do the filters affect color or sharpness?
The filters use imported AGC optical glass with multi-coating to preserve true colors and minimize flare, though some users report mixed results depending on shooting conditions.