# K&F Concept Nano-X Variable ND Filter (ND2-ND400) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9): specs and price compared

A sourced, side-by-side comparison of the K&F Concept Nano-X Variable ND Filter (ND2-ND400) (K&F Concept) and Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) (Freewell) among nd filters. K&F Concept Nano-X Variable ND Filter (ND2-ND400) is the cheaper of the two at $93.99.

## Side by side

| Spec | K&F Concept Nano-X Variable ND Filter (ND2-ND400) | Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) |
| --- | --- | --- |
| US price | $93.99 | $499.99 |
| Brand | K&F Concept | Freewell |
| Released | 2023 | 2024 |
| Filter type | variable | variable |
| Density range stops | 1 to 9 (ND2-ND400) | 1 to 9 (two filters: 1-5 and 6-9, hybrid reversible with CPL/ND32-CPL) |
| Common thread sizes (mm) | 37-105 (49, 52, 55, 58, 62, 67, 72, 77, 82 common) | 67, 72, 77, 82 (via included adapter rings) |
| Coating | 28-layer multi-coating (nano, waterproof/oil-proof) | multi-coated German optics (dust/oil/scratch/water resistant) |
| Color cast note | No hard-stop detents; an X-pattern/color cast can appear if rotated past the effective range | Freewell markets a proprietary 'TRUE COLOR' coating process specifically to minimize the color shift common to other VNDs |
| Front filter thread | Yes | — |
| Magnetic | No | Yes |
| Glass type | Japanese AGC optical glass | optical glass (German optics, brand does not publish substrate name) |

## Key differences

- Density range stops: K&F Concept Nano-X Variable ND Filter (ND2-ND400) 1 to 9 (ND2-ND400) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) 1 to 9 (two filters: 1-5 and 6-9, hybrid reversible with CPL/ND32-CPL)
- Common thread sizes (mm): K&F Concept Nano-X Variable ND Filter (ND2-ND400) 37-105 (49, 52, 55, 58, 62, 67, 72, 77, 82 common) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) 67, 72, 77, 82 (via included adapter rings)
- Coating: K&F Concept Nano-X Variable ND Filter (ND2-ND400) 28-layer multi-coating (nano, waterproof/oil-proof) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) multi-coated German optics (dust/oil/scratch/water resistant)
- Color cast note: K&F Concept Nano-X Variable ND Filter (ND2-ND400) No hard-stop detents; an X-pattern/color cast can appear if rotated past the effective range vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) Freewell markets a proprietary 'TRUE COLOR' coating process specifically to minimize the color shift common to other VNDs
- Magnetic: K&F Concept Nano-X Variable ND Filter (ND2-ND400) No vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) Yes
- Glass type: K&F Concept Nano-X Variable ND Filter (ND2-ND400) Japanese AGC optical glass vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) optical glass (German optics, brand does not publish substrate name)

## Sources

- K&F Concept Nano-X Variable ND Filter (ND2-ND400): https://www.kentfaith.com/KF01.1465 (kentfaith.com, verified 2026-08-16)
- Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9): https://freewellgear.com/products/k2-versatile-magnetic-filter-system (freewellgear.com, verified 2026-08-16)

Canonical: https://frontdeskreview.com/gear/nd-filters/kf-concept-nano-x-vnd-nd2-400-vs-freewell-k2-versatile-magnetic-vnd/
Cite: Per The Front Desk Review, K&F Concept Nano-X Variable ND Filter (ND2-ND400) ($93.99) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) ($499.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/nd-filters/kf-concept-nano-x-vnd-nd2-400-vs-freewell-k2-versatile-magnetic-vnd/
License: CC BY 4.0.