K&F Concept 37mm ND4-ND64 Variable ND and CPL Filter

K&F Concept 37mm ND4-ND64 (2-6 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2-in-1

Optical Quality

• Constructed with top-grade Japanese optical glass.
• Both sides coated with 28 layers of nano anti-reflection green film.
• Coatings provide waterproof, oil-proof, scratch-resistant, and anti-fog properties.
• Lens surfaces are ground and polished to ensure ultra-high definition without compromising image sharpness.

Filter Frame Features

• Equipped with self-locking technology allowing infinite rotation between 2 to 6 stops for precise light reduction and positioning.
• Design prevents the occurrence of black cross artifacts common in variable ND filters.
• Includes two orange levers (push rods) to facilitate easy adjustment of the filter gear size, beneficial for video shooting and automatic light reduction adjustments.
• Frame surface features CNC-machined trapezoidal patterns to increase friction, enabling easy rotation and quick installation or removal of lenses and accessories.
• Oxidation sandblasting treatment on the frame surface minimizes stray light entry and reduces reflections.

Additional Features

• Comes with a dedicated storage bag designed with a side-pull structure for convenient access and protection during transport.