A basic cross filter that generates four bright lines. PRO1D, with an enhanced coating, is also available. This medium-class filter series was developed in the mid-2000s when digital single-lens reflex cameras were popular. Adopting digital multi-coat technology, these filters achieve an overall filter transparency of 99% (protector) with a minimum price premium. The new-concept filter series employs a black-painted frame for reduced reflection in the glass, a knurled frame for easy attachment, and other user-friendly features. These filters function well not only with digital cameras but also with film cameras. GENERAL FEATURESDigital multi-coated - Digital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by reflections. Black almite frame - Filters feature a black matte aluminum satin finish almite frame which reduces reflections. Black rimmed glass - These filters are equipped with black rimmed glass to reduce the chance of light reflecting off the edge. Low profile frame - Ultra thin filter frames to help avoid vignetting on super wide angle lenses are also designed to hold a lens cap. Knurling edge frame - These filters are equipped with a straight knurling edge for non-slip, easy attachment and removal. UV protected case - Filter cases are UV protected to further lengthen the life of filters.