K&F Concept Nano-X XV56 Variable ND Filter ND2–ND400, 37 mm

Nano-X XV56 Variable ND Filter ND2–ND400 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
• Screws onto a lens with a 37 mm thread.
• The surface repels water and grease and resists scratches

Variable ND filter

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.

Tough surface

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 density is set with a lever on the edge of the frame, and every step from ND2 to ND400 is marked on the ring itself, so it can be found blind with an eye at the viewfinder. Rotation is smooth through the full 360°.