The HOYA 77mm PRO ND EX 64 is a Neutral density filter that reduces the light to an equivalent of 6 f-stops.
Neutral Density (ND) Filter are popular and essential for photographer & videographer, it gives them precise control of the amount of light passing through the lens for greater creative control over exposure. For video content creators ND filters helps much to set shutter speeds to match the frame-rate while maintaining the depth-of-field of the footage. This means that photographer or videographer can express their creativity more. This filter helps photogapher to add motion blur to the object in the conditions that generally will not allow camera shutter speed to do so.
COLOR SHIFT ISSUE SOLUTION
HOYA offers its own exclusive and wide lineup of ND filters that are branded into PROND EX series for both photographers and filmmakers. PROND EX filters adopt HOYA's clear optical glass that is mounted into a lightweight, precisely crafted aluminum frame. The frame has front filter threads so you can attach additional filters or a lens cap.
Thanks to ACCU-ND technology that puts HOYA ND filters far ahead from other brands the image undergoes no negative affect from color shift that may occur due to low-quality materials, poor manufacturing QC, or issues with leaking of the Infrared band of the light spectrum. The last problem is the most important nowadays in photography and videography.
HOYA's exclusive ACCU-ND technology achieves equal reduction of the light in visible and IR spectrums. As a result the photographer may not fear any issue with color shift when using HOYA ND filters in different shooting conditions.