Hoya 30.5mm 4x (0.6) Neutral Density Glass Filter
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In conditions of extreme light intensity, such as sunshine on snowy mountains or on the beach, or when using a camcorder, ND (Neutral Density) filters are recommended as essential.
Neutral Density filters are often ignored by photographers, but they 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 affect on color balance.
They have four main uses:
To enable slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas etc.
To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background.
To decrease the effective ISO of high speed film (i.e.: above ISO400) and allow it to be used outdoors in blight situations.
To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which would normally cause over-exposure.
Kenko has a line of high-quality filters in sizes specifically used on today's digital cameras. These filters feature the latest optical glass technology and all aluminum rings for years of use with your digital camera. UV, Skylight, Circular Polarizer, Close-up, Soften, Cross Screen, and Neutral Density filters are available in 28, 30, 30.5, 37, and 43mm sizes. (28mm and 43mm sizes in black rings only)
|Shutter Speed/Aperture Decrease||2 Stops|
|ISO Film Speed Decrease i.e. ISO800||1/4 ISO200|