K&F CONCEPT 67mm Variable ND2-400 Lens Filter (1 to 9 Stops) Review
A slim 67mm variable neutral density filter with 1 to 9 stops of adjustable light control and multi-coated AGC optical glass.
| Brand | K&F CONCEPT |
|---|---|
| Category | Camera Filters |
| Filter Size | 67mm |
| Variable Range | ND2 to ND400, about 1 to 9 stops |
| Optical Material | AGC optical glass with 8 multi-layer coatings |
| Thickness | 7.4mm |
| Best for | Long exposures and video in changing light with 67mm lenses |
Product Overview
K&F CONCEPT's 67mm Variable ND2-400 filter is an adjustable neutral density filter that spans 1 to 9 stops of light reduction. It uses multi-coated AGC optical glass and a slim, glare-resistant metal ring for 67mm lenses.
This review checks the filter's stated build, light control range, handling details, and the compatibility notes from the listing, without adding specs that are not confirmed.
Score Breakdown
This verdict is based on the manufacturer's stated specifications, the current Amazon listing and its product images, the confirmed materials and design, real buyer ratings, and our research into the product category. Scores are consistent editorial judgments, not laboratory measurements, and we did not receive a paid sample.
Key Features
Uses premium AGC optical glass with 8 multi-layer coatings to reduce reflections and glare for clean image detail.
Provides adjustable light reduction from ND2 to ND400 with 360 degree rotation; max stops may show an X black cross.
Oxidized sandblasting treatment prevents unwanted stray light and cuts reflections on the filter ring.
At 7.4mm thick, the CNC-patterned ring adds friction for easier rotation and quick attachment.
Fits all 67mm lens threads; check the diameter symbol before ordering. A 72mm lens cap is required.
Design and Build Quality
The filter is listed at 7.4mm thick and uses a CNC-patterned ring to improve grip while rotating. AGC optical glass carries 8 multi-layer coatings, and the metal surface is oxidized sandblasted to limit stray light and reflections.
One practical note is that the 67mm variable filter requires a 72mm lens cap, so the original 67mm cap will not fit once mounted. The listing does not confirm weather sealing or exact glass hardness.
Performance in Everyday Use
The adjustable range covers ND2 to ND400, about 1 to 9 stops, with 360 degree rotation for fine dimming. Coated glass is intended to reduce reflections and glare, which can help hold contrast in bright scenes.
The listed limitation is that maximum stops can cause a cross-pattern effect, often called an X black cross. This is described as natural and temporary for this adjustable filter with certain lenses and focal lengths, so it is not a defect but a known behavior at strong settings.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Light reduction range | 1 to 9 stops with 360 degree rotation | Feature bullet: 1 to 9 stops of adjustable light reduction | 8.5 | Broad range covers most bright light needs but max stops can show X cross. |
| Optical clarity | Multi-coated AGC optical glass | Feature bullet: premium AGC optical glass with 8 multi-layer coatings | 8.0 | Coatings should cut reflections and glare, though no test data confirms color fidelity. |
| Build and handling | 7.4mm slim ring with CNC pattern | Feature bullet: 7.4mm thickness, CNC-patterned design ensures enhanced friction | 8.5 | Slim profile and textured ring aid rotation and attachment. |
| Glare control | Oxidized sandblasting finish | Feature bullet: oxidized sandblasting process prevents unwanted stray light | 8.0 | Metal surface treatment reduces stray light, though edge blackening is not mentioned. |
| Compatibility | Fits 67mm lenses, 72mm cap required | Compatibility note: suits all 67mm lenses, 72mm filter cap required | 7.5 | Useful for 67mm owners but nonstandard cap requirement is inconvenient. |
Who Should Buy It
- 67mm lens owners
- Landscape photographers
- Video shooters in bright light
- Hobbyists wanting one adjustable ND
- Travel kits needing slim filters
- Shooters needing full 9 stops without any cross-pattern artifacts
- Max stops can cause a cross-pattern X black cross
- Requires a 72mm lens cap instead of a standard 67mm cap
Full Specifications
How It Compares
| Feature | K&F CONCEPT | Typical option | Higher-tier option |
|---|---|---|---|
| Light control range | 1 to 9 stops variable | Often 1 to 8.6 stops variable | Fixed ND or 1 to 5 stops variable |
| Glass type | AGC optical glass, 8 multi-layer coatings | Japanese or Schott glass, 16 to 20 coatings | Uncoated or basic coated glass |
| Thickness and grip | 7.4mm slim, CNC-patterned ring | Similar slim profile, often with front threads | Thicker ring, basic knurling |
| Glare control | Oxidized sandblasting on metal surface | Anti-reflective coating on glass, blackened edges | Painted ring, less stray light control |
| Lens cap compatibility | Requires 72mm lens cap | Usually accepts same-size cap | Often same-size or step-up cap |
| Known artifacts | X cross possible at max stops | Cross pattern possible at high density, less common at extreme | No cross but limited range |
Alternatives Worth a Look
This is a capable slim variable ND for 67mm lenses if you accept the known X cross at the strongest settings and buy a 72mm lens cap. The coated AGC glass and anti-glare barrel are practical details for long-exposure and video work.
Frequently Asked Questions
What size lenses does this filter fit?
It fits all 67mm filter threads. Check the lens diameter symbol, usually a circle with a slash, before ordering.
What is the light reduction range?
The filter is variable from ND2 to ND400, about 1 to 9 stops, with 360 degree rotation.
Does the filter show an X cross pattern?
At maximum stops, the listing notes a cross-pattern effect, known as an X black cross, can occur with certain lenses and focal lengths. It is described as natural and temporary.
What lens cap should be used?
The listing says a 72mm lens cap is required for this 67mm variable ND filter, so the original 67mm cap will not fit.
What is included in the box?
The listing includes the filter and a microfiber cleaning cloth.
Is the glass coated?
Yes, it uses premium AGC optical glass with 8 multi-layer coatings to reduce reflections and glare.
This review is based on the manufacturer's stated specifications, the current Amazon product listing and its images, the confirmed materials and design, and our own research into camera filters as a product category. Our scores are editorial judgments made against consistent criteria, not laboratory measurements, and we did not carry out destructive or long-term stress testing.
Where the listing did not clearly confirm a detail, such as exact dimensions, weight or certifications, we have deliberately left it out rather than guess. If you are buying, always confirm the current specification and price on the live Amazon listing, since configurations and availability change.