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The Hoya 77mm Neutral Density (ND) 0.9 Pro 1 Digital Multi-Coated Glass Filter has several uses, and offers the possibility to achieve otherwise unachievable results. ND filters appear grey, and reduce the amount of light reaching the film. They have no effect on color balance.
Note: Pro 1 Digital filters are ultra thin, but have a front thread.
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, which help to 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, which further lengthens the life of filters
Neutral Density Filters have four main uses:
To enable slow shutter speeds to be used, especially with high-speed films, to record movement in subjects such as waterfalls, clouds, or cars
To decrease depth-of-field by allowing wider apertures to be used, which helps to separate subjects from their background
To decrease the effective ISO of high-speed film (above ISO 400), and allow it to be used outdoors in bright situations
To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes, which could cause overexposure