K&F Concept ND8 filter for DJI Osmo Action 5 Pro / Action 4 / Action 3 – 3-stop neutral density (optical glass)
Product description
The essentials
If you shoot video in bright daylight, exposure can become a bit of a tug-of-war: you want a steadier look, but the camera naturally lets in more light than you always need. This K&F Concept ND8 filter is designed to reduce incoming light by about 3 stops, which (on paper) helps you control exposure and manage shutter speed when conditions are harsh.
It’s not a “creative filter” so much as a practical one. An ND filter typically helps smooth motion and keeps settings under control without you constantly fighting the camera’s automatic adjustments. The “ND8” part matters here: it’s intended for moderate light reduction, rather than the darkest end of ND ranges.
Key features and what they mean in practice
The manufacturer’s approach here is fairly clear: a bayonet-style mounting intended for quick installation, plus multi-layer optics to reduce flares and glare.
The practical benefits you’ll likely notice are: - The 3-stop reduction should give you more breathing room in bright scenes, especially if you’re trying to keep the look consistent from shot to shot. - The multi-coated optics are meant to cut down on glare/flares, which matters when the sun hits reflective surfaces or you’re shooting at an angle. - The filter is described as waterproof, scratch-resistant, dustproof and oil-proof. That’s the kind of protection you tend to care about when you’re filming outdoors or with a camera that may get knocked about.
Where the “optical glass” angle is worth mentioning is colour stability. The base description says each filter uses imported AGC optical glass and is intended to avoid affecting image quality, including preserving actual colour. That’s exactly the sort of promise you want to see with ND filters, because cheap coatings can introduce odd shifts.
What stands out (and where it may feel limiting)
This filter seems aimed at everyday durability and straightforward exposure control. If you’re often shooting in bright environments and you want less blown highlights or a more manageable shutter speed, it makes sense to consider an ND8 like this.
That said, it’s not for every situation. ND8 is a moderate reduction, so it can feel like it “isn’t enough” if you regularly film in very strong midday sun and want a bigger drop in light. Also, if your priority is ultra-fast action look experiments (where you might want heavier ND), you may find ND8 sits in a middle ground.
So yes, it’s a solid utilitarian accessory—but not the one you’d pick if you’re chasing the darkest ND effects.
Getting the most from it
Installation is described as a bayonet mounting approach: remove the original filter, rotate and screw it in. In real terms, the value of that kind of system is reduced faff, particularly when you’re swapping filters between locations.
A quick micro-scenario: imagine you’re filming a coastal walk where the path alternates between shade and bright water reflections. Without an ND, exposure can jump and you end up with inconsistent brightness across clips. With a 3-stop ND8, you should get more control over how much light reaches the sensor in those bright moments, making your footage easier to keep looking uniform.
Specs that matter for buying decisions
Tech specs
- Type: Neutral density (ND) filter
- Intended light reduction: 3-f stop (ND8)
- Mounting approach: Bayonet mounting installation (rotate and screw in)
- Glass: AGC optical glass
- Coatings: 28 multi-layer coatings
- Intended protection: waterproof, scratch-resistant, dustproof, oil-proof
Note worth making: the description says “no effect on the image quality” and emphasises colour restoration, but it doesn’t provide any independent test results here. So it’s reasonable to treat those claims as “as stated by the brand” when you’re judging value.
Who it suits best (and who should skip it)
It makes sense if you commonly shoot Action 5 Pro / Action 4 / Action 3 in bright conditions and want a straightforward ND level to reduce light entering the sensor and help control shutter speed.
It may not be the best match if: - you mainly film indoors or at night (you may not need ND reduction at all) - you want very heavy light reduction for consistently slower shutter looks in the brightest sun - you prefer to avoid third-party filters altogether and only want OEM-style options (this is more about personal workflow than performance)
If you’re the sort of person who already tweaks exposure and shutter targets rather than relying purely on auto, ND8 can be a practical addition to your kit.
Is it worth it?
Buy it if you want a moderate ND filter for bright daylight and you like the idea of multi-layer optical glass with flare/glare reduction, plus the added protection details for outdoor use. The stated 3-stop reduction is a sensible middle choice for controlling exposure without going too extreme.
Skip it if you mostly shoot in low light, or if you routinely need stronger light reduction than ND8 can provide. And do a quick check before committing: confirm that the filter mounting and use case match your specific Action model and what you’re trying to achieve (exposure control and shutter speed management).
Mini FAQ
Frequently asked questions
Does an ND8 reduce light by a fixed amount? Yes, ND8 is intended to reduce light by about 3 stops, according to the product description.
Will it make footage darker in bright outdoor scenes? That’s the point. By reducing light entering the sensor, it should help keep exposure more controlled outdoors.
Is the filter designed for outdoor protection? The description claims waterproof, scratch-resistant, dustproof and oil-proof construction, which suits active filming.
Is colour stability guaranteed? The brand states it’s designed to preserve actual colour and avoid image quality impact, but there aren’t independent results listed here—so take that as the manufacturer’s claim.