Features:
- 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
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