K&F Concept's 77mm Nano-X Series Blue Streak Filter adds blue transparent lines to the image to create blur, distortion and other visual effects. Grinding and polishing technology applied on both sides of the filter ensures that the sharpness of the image is maintained. The filter is made of 2mm optical glass and has a 28-layer coating that reduces reflections and makes the filter waterproof, oil-resistant and scratch-resistant. The filter frame is made of aluminum and is only 5.3 mm thick. The surface of the frame has a trapezoid pattern for better handling.