This comparison examines five variable neutral density camera filters from K&F Concept, designed to help photographers manage overexposure in bright conditions. While all models share similar optical features like AGC glass and multi-layer coatings, they differ significantly in thread size and stop range. The lineup includes both traditional screw-in models and a newer magnetic option, catering to different mounting preferences and lens diameters.
| Product | Price | Key Attribute |
|---|---|---|
| K&F CONCEPT 77mm Magnetic Variable ND 2-32 Filter+Magnetic Ring | $77.99 | Magnetic mount, 2-32 ND range |
| K&F CONCEPT 77mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $74.95 | 77mm thread, 3-7 stop range |
| K&F CONCEPT 82mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $79.95 | 82mm thread, 3-7 stop range |
| K&F CONCEPT 58mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $49.46 | 58mm thread, 3-7 stop range |
| K&F CONCEPT 62mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $62.95 | 62mm thread, 3-7 stop range |
Prices shown above are accurate as of 2026-09-23.
K&F CONCEPT 77mm Magnetic Variable ND 2-32 Filter+Magnetic Ring
The K&F CONCEPT 77mm Magnetic Variable ND 2-32 Filter distinguishes itself with a magnetic mounting system that claims installation in one second, compared to roughly six seconds for standard threaded filters. It offers the widest stop range in this group, adjustable from 2 to 32 (1-5 stops), providing more flexibility for extreme lighting changes. Like the other models, it utilizes Japanese AGC optical glass and features a 28-layer nanometer coating for scratch resistance and color accuracy.
Read our full review of K&F CONCEPT 77mm Magnetic Variable ND 2-32 Filter+Magnetic Ring
All pricing valid as of publish date — to see current pricing, click here.
K&F CONCEPT 77mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The K&F CONCEPT 77mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross is designed for lenses with a 77mm thread size. It features an ultra-slim 7.4mm frame specifically engineered to minimize vignetting on wide-angle lenses, supporting focal lengths down to 28mm. This model uses a standard screw-in mechanism rather than a magnetic system, offering a 3-7 stop range for versatile exposure control.
Read our full review of K&F CONCEPT 77mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
All pricing valid as of publish date — to see current pricing, click here.
K&F CONCEPT 82mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The K&F CONCEPT 82mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross is sized for larger lenses with an 82mm thread diameter. It shares the same optical specifications as its smaller siblings, including imported AGC glass and a 28-layer NANOTEC coating. The ultra-slim 7.4mm frame design remains consistent to help avoid vignetting issues on wide-angle shots.
Read our full review of K&F CONCEPT 82mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
All pricing valid as of publish date — to see current pricing, click here.
K&F CONCEPT 58mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The K&F CONCEPT 58mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross is tailored for cameras with smaller lens diameters, specifically those with a 58mm thread. It provides the standard 3-7 stop adjustment range and utilizes the same self-lock frame technology to prevent the 'X' cross artifact common in variable ND filters. The 7.4mm ultra-slim profile ensures compatibility with wide-angle lenses without introducing vignetting.
Read our full review of K&F CONCEPT 58mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
All pricing valid as of publish date — to see current pricing, click here.
K&F CONCEPT 62mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The K&F CONCEPT 62mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross fits lenses with a 62mm thread size. Like the 58mm and 77mm versions, it incorporates a 7.4mm ultra-slim frame to mitigate vignetting risks on wide-angle focal lengths. This filter uses AGC glass and a 28-layer multi-layer coating to maintain image sharpness and protect the lens front element.
Read our full review of K&F CONCEPT 62mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
All pricing valid as of publish date — to see current pricing, click here.
Verdict
For those prioritizing convenience and the widest range of light reduction, the K&F CONCEPT 77mm Magnetic Variable ND 2-32 Filter is the top choice, offering a faster 1-second magnetic swap and a 1-5 stop adjustability. For photographers with smaller 58mm lenses seeking a standard threaded option with the same premium optical coatings and slim frame design, the K&F CONCEPT 58mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross is the recommended pick.
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