K&F Concept Nano-C 3-in-1 filter: variable ND2–ND32, CPL and Black Mist 1/4 55 mm K&F Concept

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Nano-C — variable ND filter 55 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.

• 18 anti-reflective layers
• Screws onto a lens with a 55 mm thread.
• 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.

• 3-in-1 filter (variable ND2–ND32, CPL, Black Mist 1/4) — 1 pc
• Plastic case — 1 pc

• Filter type: Combined 3-in-1: variable ND + CPL + Black Mist 1/4
• Series: Nano-C
• Thread size: 55 mm
• Glass: AGC optical glass
• Coatings: 18
• Frame: aluminium alloy, CNC-machined frame with matte finish
• ND range: ND2 – ND32
• Stops: 1–5 stops
• Surface treatment: water-repellent, grease- and scratch-resistant