K&F Concept Nano-X magnetic variable ND filter ND2–ND32 82 mm K&F Concept

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Nano-X Magnetic — variable ND filter 82 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, reflectance 0.2 %
• Magnetic mount — on and off in a second
• The surface repels water and grease and resists scratches

Magnetic mount

The filter goes on magnetically — a magnetic adapter ring screws onto the lens and the filter holds itself on. A swap takes a second and nothing has to be screwed.

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 glass carries 28 anti-reflective layers and reflects only 0.2 % of the light, so no ghosting or veiling appears against the light.

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. The ND2 to ND32 range is the one used most in video — it keeps the shutter at 1/50 from shade to hard sunlight. The end stops prevent turning into the position where cheap variable NDs produce the dark cross across the frame.

• Variable ND filter — 1 pc
• Magnetic adapter ring — 1 pc
• Plastic case — 1 pc

• Filter type: Variable ND filter
• Series: Nano-X Magnetic
• Thread size: 82 mm
• Mount: magnetic, onto an adapter ring
• Glass: AGC optical glass
• Coatings: 28
• Reflectance: 0.2 %
• Frame: aluminium alloy with end stops
• ND range: ND2 – ND32
• Stops: 1–5 stops
• Surface treatment: water-repellent, grease- and scratch-resistant