K&F 58MM, NANO-X Pro Brass Frame,CPL+Variable/Fader ND2-32

Nano-X Pro — variable ND filter 58 mm, changes the amount of light steplessly as you turn it.

• 36 anti-reflective layers, reflectance 0.15 %
• Screws onto a lens with a 58 mm thread.
• The surface repels water and grease and resists scratches

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 36 anti-reflective layers and reflects only 0.15 % 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 filter combines two pieces of glass that otherwise have to be stacked: a polariser and a variable ND from ND2 to ND32. That removes one element from the light path and with it the vignetting risk of two stacked filters. The darkening is set with the levers on the rim, so it can be changed with an eye at the finder.

The frame is brass, not aluminium. Brass does not seize in the thread, so the filter comes off even after a season on the lens and does not jam at the moment it has to be swapped in a hurry.