HOYA 55NDX2 Neutral Density Filter ? 2X ? 55MM: Electronics. Neutral density filters like the Hoya 55NDX2 are used to slow shutter speeds with fast films, to decrease depth of field, and to lower the effective ISO of high speed film 。 Neutral density filters are often overlooked by beginning photographers, despite multiple uses 。 The ND filter can be used to lengthen exposure time, creating effects such as white foaming water in landscape photos that seems almost in motion 。 The 2X filter factor used with the 55NDX2 means, quite simply, that twice as much light is needed for exposure when the filter is mounted 。 Opening the lens one stop or setting the shutter speed for twice the amount of time assures correct exposure 。 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 gray and reduce the amount of light reaching the film, they have no affect on color balance. 。 。 。
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