K&F 40.5MM NANO X Serie-3-in-1 Multi-Function Variable ND2-32&CPL& Black Mist 1/4 K&F Concept

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Nano-X — variable ND filter 40.5 mm, changes the amount of light steplessly as you turn it.

• 28 anti-reflective layers
• Screws onto a lens with a 40.5 mm thread.
• The surface repels water and grease and resists scratches

A variable ND replaces a whole set of fixed grey filters — turning the front ring changes how much light gets through, steplessly. While filming the shutter stays at 1/50 s even as the sun goes behind a cloud and comes back, with no need to stop the take or swap a filter.

The surface repels water and grease, so drops run off and fingerprints wipe away without smears; the coating also stands up to cleaning in the field.

One piece of glass does the work of three filters: it cuts one to five stops, kills reflections like a polariser when turned, and diffuses highlights like a Black Diffusion 1/4.

The front frame is one size larger than the thread so that even a wide-angle lens shows no dark corners. A lens hood therefore cannot be fitted over the filter.

• Variable ND filter — 1 pc
• Fabric pouch — 1 pc

• Filter type: Variable ND filter
• Series: Nano-X
• Thread size: 40.5 mm
• Glass: Japanese optical glass
• Coatings: 28
• Frame: aviation-grade aluminium, CNC-machined, non-slip pattern
• ND range: ND2 – ND32
• Stops: 1–5 stops
• Surface treatment: water-repellent, grease- and scratch-resistant