The Vocas MB-250 is especially designed for use with Zeiss CP2 lenses. Therefore, this mattebox is compatible with lenses having a front diameter of up to 114 mm. The matte box is equipped with a Quick-Lock mounting system that attaches directly to the front lens. This matte box accommodates 3x3 "by means of 4x6" filters and works with most wide angle lenses in both 4: 3 and 16: 9 aspect ratios. The Vocas MB-250 has a rotating and a fixed 4 "wide filter drawer" and it also features a patented "heavy duty" French flag clamper. Internal eyebrows are standard on the MB-250. They can be operated from the outside of the matte box. Through this patented internal French flags the user can fit the matte (or mask) to the zoom position of the lens.