These five K&F CONCEPT variable neutral density filters share an identical optical construction but differ in thread diameter. Each model uses imported AGC glass and a self-locking frame to eliminate the common 'X' cross artifact found on many variable ND filters. The primary distinction between these options is the thread size, ranging from 40.5mm to 72mm, so the correct choice depends entirely on your specific camera lens thread.
| Product | Price | Key Attribute |
|---|---|---|
| K&F CONCEPT 72mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $69.99 | 72mm thread diameter |
| K&F CONCEPT 52mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $49.99 | 52mm thread diameter |
| K&F CONCEPT 67mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $60.26 | 67mm thread diameter |
| K&F CONCEPT 49mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cro… | $49.99 | 49mm thread diameter |
| K&F CONCEPT 40.5mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X C… | $45.99 | 40.5mm thread diameter |
Prices shown above are accurate as of 2026-09-26.
K&F CONCEPT 72mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The 72mm K&F CONCEPT variable ND filter is designed for larger lens diameters, specifically those with a 72mm thread. It features imported AGC glass and a 7.4mm ultra-slim frame to minimize vignetting on wide-angle lenses, supporting focal lengths down to 28mm. The self-locking frame and 28-layer NANOTEC coating help prevent the 'X' cross and protect the lens surface. This size is compatible with a 77mm lens cap or hood.
Read our full review of K&F CONCEPT 72mm 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 52mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The 52mm K&F CONCEPT variable ND filter is suited for lenses with a 52mm thread, offering the same ND8-ND128 (3-7 stop) range as its larger siblings. It utilizes imported AGC glass to maintain color balance and sharpness without color cast. The 7.4mm ultra-slim frame reduces the risk of vignetting, and the CNC-non-slip design aids in installation. Users should note that this filter requires a 55mm lens cap or hood for compatibility.
Read our full review of K&F CONCEPT 52mm 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 67mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
This 67mm K&F CONCEPT variable ND filter is tailored for lenses with a 67mm thread size. It shares the core technology of the range, including imported AGC glass and a self-locking frame to avoid the 'X' cross artifact. The 7.4mm ultra-slim frame is designed to avoid vignetting on wide-angle lenses, with specific support for 28mm focal lengths. This filter is compatible with a 72mm lens cap or hood and features the 28-layer NANOTEC coating.
Read our full review of K&F CONCEPT 67mm 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 49mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The 49mm K&F CONCEPT variable ND filter is intended for lenses with a 49mm thread. It offers the standard ND8-ND128 variable range and uses imported AGC glass for clarity and color accuracy. The design includes a 7.4mm ultra-slim frame to prevent vignetting and a self-locking mechanism to eliminate cross artifacts. This size pairs with a 52mm lens cap or hood and features the same 28-layer NANOTEC protective coating as other models in this series.
Read our full review of K&F CONCEPT 49mm 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 40.5mm Variable ND Lens Filter ND8-ND128 (3-7 Stop) No X Cross
The 40.5mm K&F CONCEPT variable ND filter is the smallest option in this comparison, fitting lenses with a 40.5mm thread. It provides the full ND8-ND128 variable density range using imported AGC glass. The 7.4mm ultra-slim frame helps avoid vignetting, and the self-locking frame prevents the 'X' cross on wide-angle shots. This filter is compatible with a 43mm lens cap or hood and includes the 28-layer NANOTEC coating for durability.
Read our full review of K&F CONCEPT 40.5mm 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
The K&F CONCEPT 72mm Variable ND Lens Filter is the best overall choice among these options by Amazon sales rank, offering the same high-quality AGC glass and anti-vignetting features for larger lenses. The K&F CONCEPT 40.5mm Variable ND Lens Filter is the best value pick, providing the complete variable ND functionality and premium coating for smaller lens formats. Since all five products share identical optical specifications, your decision should be based strictly on the thread diameter of your specific camera lens.
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