For color or b/w films, to reduce or eliminate reflections and to increase color saturation, e.g. in the sky.
Hasselblad Our filters are supplied in sizes to fit our various lens mounts and the Proshade 6093T. You can also attach larger Hasselblad filters on smaller lens mounts using step-up rings, or standard 67 or 77 mm filters using filter adapter rings. On the edge of each filter, you will find engraved designations indicating diameter, filter factor, and exposure value reduction (EV).