The Hoya Variable Density filter uses two polarizing layers to
control the amount of light that passes through the filter and into
the camera lens. At it's minimum effect the filter passes 1/3 of
the light in a scene. That is equal to 1.5 stops on the aperture or
shutter speed. At it maximum effect the filter passes just 1/400 of
the light in a scene. That is equal to 9 stops on the aperture or
After the filter is mounted on the lens, turning the filter ring
between “Min” and “Max” can greatly control the amount of light
entering the lens. With the Hoya Variable Density filter it is
possible to shoot with fast lenses like a 50mm f/1.4 lens wide open
at f/1.4 in full sun for a very shallow depth of field. Or, to slow
down the shutter speed to where the shutter can be open for several
seconds in full sunlight. This is enough to create artistic
blurring shots of motion on water, cars, people or almost anything
that moves. The creative possibilities are endless.
The Hoya Variable Density filter uses high-quality optical glass
from Hoya Corporation, the worlds largest optical glass
manufacturer and is available in sizes 52mm to 82mm.
For best results Hoya recommends using a tripod when photographing
with slow shutter speeds.
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