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Hoya 77mm ND400x HMC Filter

(Part #: A77ND400)
Hoya 77mm ND400x HMC Filter
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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 several uses and offer 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. This neutral density filter has three main uses: 1) To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars. 2) To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. 3) To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations. Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting. Neutral Density factor: ND400x (exposure adjustment = approx. 9 stops, reduces ISO 1/500)
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