K&F Concept Nano-X 3-in-1 filter: variable ND2–ND32, CPL and Black Mist 1/4 67 mm K&F Concept

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Nano-X 3-in-1 filter: variable ND2–ND32, CPL and Black Mist 1/4 67 mm, changes the amount of light steplessly as you turn it. It is a favourite for filming on bright days, as it lets you keep a cinematic shutter and a wide aperture without blown highlights or swapping filters between takes.

• 28 anti-reflective layers
• The surface repels water and grease and resists scratches

Light under control with one turn

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.

• Combined variable ND + CPL + Black Mist 1/4 67 mm — 1 pc
• Fabric pouch — 1 pc

• Filter type: Combined variable ND + CPL + Black Mist 1/4
• Series: Nano-X
• Thread size: 67 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