K&F 49mm, Blue Streak Filter, 2mm Thickness, HD, Waterproof, Anti Scratch, Green Coated

Nano-X — anamorphic streak filter 49 mm, stretches highlights into a horizontal flare.

• 28 anti-reflective layers, reflectance 0.2 %
• Screws onto a lens with a 49 mm thread.
• The surface repels water and grease and resists scratches

A streak filter has a cylindrical element set into the glass that stretches point lights into a long horizontal flare — the same effect anamorphic lenses produce. Headlights, street lamps and reflections off a bonnet get that cinematic line across the frame, with no anamorphic glass required.

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 flare is blue, which suits the night-time city, neon and car headlights, where the cool tone sits well with the surrounding colour. Turning the filter changes the angle of the streak — horizontal as on an anamorphic lens, or slanting across the frame.