This is a Graduated Neutral Density Filter used for Cinematography. 50% of the filter is clear and 50% has a Neutral Density of 0.6 (2 stops). The transition from clear to ND is done with a SOFT EDGE (SE) transition line. SOFT EDGE grads lines are used with wide angle and normal focal length lenses. Graduated Neutral Density filters are used to balance exposure within a scene. One very common use is to balance the exposure of sky and earth in a landscape, avoiding overexposed blank white skies.
All Schneider Graduated filters are part clear and part color. They are designed to be used in professional matte boxes, so that they are readily positioned at the exact angle required to create desired effects.
Schneider Neutral Density (ND) Grads can be used to balance exposure in uneven lighting situations or to increase color saturation in sky scenes, by lowering sky exposure.
Schneider makes both soft-edge and hard-edge Graduated Color filters. Typically soft-edge filters are used with wide to medium-angle lenses because these lenses have greater depth of field. Hard-edge filters are preferred for use with telephoto lenses or for bold transitions.