HOYA 67mm HMC ND400 Filtre

NEUTRAL DENSITY 400

 This filter reduces light values.  It can also be used to achieve super slow shutter speeds in daylight to render moving subjects invisible.

The use of an ND filter allows the photographer to utilize a larger aperture that is at or below the diffraction limit, which varies depending on the size of the sensory medium (film or digital) and for many cameras, is between f/8 and f/11, with smaller sensory medium sizes needing larger sized apertures, and larger ones able to use smaller apertures. With using ND filters to limit the light instead of the aperture, the photographer can then set the shutter speed according to the particular motion desired (blur of water movement, for example) and the aperture set for maximum sharpness. Using a digital camera, which provides results right away, a photographer could find the right ND filter to use for the scene being captured by first knowing the best aperture to use for maximum sharpness desired. The shutter speed would be selected by finding the desired blur from subject movement. The camera would be set up for these in manual mode, and then the overall exposure then adjusted darker by adjusting either aperture or shutter speed, noting the number of stops needed to bring the exposure to that which is desired. That offset would then be the amount of stop needed in the ND filter to use for that scene

HMC (Hoya Multi-Coated)
These popular filters are renowned for their ability to minimize reflection a the filter surfaces which reduces flare and ghosting. The result an average light transmission of over 97%, giving sharp contrast and well balanced color. HOYA HMC filters are recommended for enhancing the performance today's multicoated lenses.