Hoya 77mm ND400x HMC Filter

The Hoya Neutral Density x400 (ND) 2.7 Hoya Multi-Coated (HMC) 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.

Multi-coated to minimize reflection at the filter surfaces which reduces flare and ghosting.

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Photographing solar eclipses and ultra-bright light sources can be
extremely dangerous. This filter reduces light values by 9 stops to
less than 1/500th of its original intensity and allows safe
photography. It can also be used to achieve super slow shutter speeds
in daylight to render moving subjects invisible.

Neutral Density filters have four main uses

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To enable slow shutter speeds to be used, especially with high speed
films, to record movement in subjects such as waterfalls, clouds, or
cars

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To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background

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To decrease the effective ISO of high speed film (above ISO 400) and
allow it to be used outdoors in bright situations

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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

Neutral Density Factors

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2x = ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)

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4x = ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)

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8x = ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)

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As one of the premier filter manufacturers, Hoya filters continue to
made from quality glass assuring the photographer clear, sharp and
accurate images

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Hoya filters consistently provide even color all the way through the
filter; All surfaces are ground and polished to specific thickness and
tolerances

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Even non-multi-coated Hoya filters have one layer of anti-reflective
coating applied to each surface of the glass; Hoya’s single layer
coating decreases light reflection off the surface from approx. 9% to
an average of 4-5%