# Breakthrough Photography X4 Neutral Density vs K&F Concept Nano-X Variable ND Filter (ND2-ND400): specs and price compared

A sourced, side-by-side comparison of the Breakthrough Photography X4 Neutral Density (Breakthrough Photography) and K&F Concept Nano-X Variable ND Filter (ND2-ND400) (K&F Concept) 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 | Breakthrough Photography X4 Neutral Density | K&F Concept Nano-X Variable ND Filter (ND2-ND400) |
| --- | --- | --- |
| US price | $139 | $93.99 |
| Brand | Breakthrough Photography | K&F Concept |
| Released | 2017 | 2023 |
| Filter type | fixed | variable |
| Density range stops | 3, 6, 10, or 15 (separate fixed-density SKUs) | 1 to 9 (ND2-ND400) |
| Common thread sizes (mm) | 39-112, plus 100mm/150mm square | 37-105 (49, 52, 55, 58, 62, 67, 72, 77, 82 common) |
| Coating | MRC16 (16-layer Multi-Resistant Coating) + Nanotec nano coating | 28-layer multi-coating (nano, waterproof/oil-proof) |
| Color cast note | Manufacturer states spectrally flat transmission targeting color-neutral results | No hard-stop detents; an X-pattern/color cast can appear if rotated past the effective range |
| Front filter thread | Yes | Yes |
| Magnetic | No | No |
| Glass type | SCHOTT B270 optical glass | Japanese AGC optical glass |

## Key differences

- Filter type: Breakthrough Photography X4 Neutral Density fixed vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) variable
- Density range stops: Breakthrough Photography X4 Neutral Density 3, 6, 10, or 15 (separate fixed-density SKUs) vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) 1 to 9 (ND2-ND400)
- Common thread sizes (mm): Breakthrough Photography X4 Neutral Density 39-112, plus 100mm/150mm square vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) 37-105 (49, 52, 55, 58, 62, 67, 72, 77, 82 common)
- Coating: Breakthrough Photography X4 Neutral Density MRC16 (16-layer Multi-Resistant Coating) + Nanotec nano coating vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) 28-layer multi-coating (nano, waterproof/oil-proof)
- Color cast note: Breakthrough Photography X4 Neutral Density Manufacturer states spectrally flat transmission targeting color-neutral results vs 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
- Glass type: Breakthrough Photography X4 Neutral Density SCHOTT B270 optical glass vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) Japanese AGC optical glass

## Sources

- Breakthrough Photography X4 Neutral Density: https://breakthrough.photography/products/x4-neutral-density (breakthrough.photography, verified 2026-08-16)
- K&F Concept Nano-X Variable ND Filter (ND2-ND400): https://www.kentfaith.com/KF01.1465 (kentfaith.com, verified 2026-08-16)

Canonical: https://frontdeskreview.com/gear/nd-filters/breakthrough-photography-x4-nd-vs-kf-concept-nano-x-vnd-nd2-400/
Cite: Per The Front Desk Review, Breakthrough Photography X4 Neutral Density ($139) vs K&F Concept Nano-X Variable ND Filter (ND2-ND400) ($93.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/nd-filters/breakthrough-photography-x4-nd-vs-kf-concept-nano-x-vnd-nd2-400/
License: CC BY 4.0.