K&F Concept
K&F Concept Nano-X Variable ND Filter (ND2-ND400)
$93.99Cheaper
Released 2023
Best Nd Filters · head-to-head
K&F Concept Nano-X Variable ND Filter (ND2-ND400) vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9)
A sourced, side-by-side comparison. K&F Concept Nano-X Variable ND Filter (ND2-ND400) is cheaper at $93.99. Every spec and price links to its source.
Freewell
Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9)
$499.99
Released 2024
Which is better: the K&F Concept Nano-X Variable ND Filter (ND2-ND400) or Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9)?
On the specs we track, they're closely matched. The K&F Concept Nano-X Variable ND Filter (ND2-ND400) is the cheaper at $93.99.
See K&F Concept Nano-X Variable ND Filter (ND2-ND400) on Amazon See Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) on Amazon
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| 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) |
Sources — K&F Concept Nano-X Variable ND Filter (ND2-ND400): kentfaith.com (verified 2026-10-07). Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9): freewellgear.com (verified 2026-09-27).
What's the difference between the K&F Concept Nano-X Variable ND Filter (ND2-ND400) and Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9)?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- 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) false vs Freewell K2 Versatile Magnetic Filter System (VND1-5 / VND6-9) true
- 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)