This nd 03 to nd 15 variable filter is manufactured by schneider optics in germany to exacting standards with a simple twist the filter may be adjusted from 1 fstop through to 5 stops the filter is multi coated to reduce reflections and resist abrasion and the additional nano coating helps to bead and repel moisture the xs pro digital mount is manufactured from brass for durability with a black anti reflective coating and a narrow design to reduce vignetting