K&F Concept Nano-X variable ND filter ND8–ND128 without X-Cross, 37 mm K&F Concept

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Nano-X variable ND filter ND8–ND128 without X-Cross 37 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 %
• Screws onto a lens with a 37 mm thread.
• Water-, grease- and scratch-resistant surface

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 range is marked on the ring in ND8, ND16, ND32, ND64 and ND128 steps, so it can be set blind. The glass has parallel faces and the ring has end stops — the filter cannot be turned into the position where cheap variable NDs produce the dark cross across the frame.

• Variable ND filter 37 mm — 1 pc

• Filter type: Variable ND filter
• Series: Nano-X
• Thread size: 37 mm
• Glass: optical glass, double-sided multilayer green coating
• Coatings: 28
• Reflectance: 0.2 %
• Frame: aluminium alloy with end stops
• Frame thickness: 7.4 mm
• ND range: ND8 – ND128
• Stops: 3–7 stops
• Surface treatment: water-repellent, grease- and scratch-resistant