K&F 49MM, NANO-X-Magnetic Variable ND2-32 filter,HD, Waterproof, Anti Scratch, Green Coated

Nano-X Magnetic — variable ND filter 49 mm, changes the amount of light steplessly as you turn it.

• 28 anti-reflective layers
• Magnetic mount — on and off in a second
• 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 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.

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.