For Longer Exposures
Without changing the aperture, the Variable NDX filter allows the
freedom to change the shutter speed according to the effect
desired. For example, without adjusting the aperture, the same 1/60
scene can be taken using the Variable NDX filter with shutter speeds
from 1/20 to 6 seconds, with just a turn of the outer filter ring.
The problem of diffraction is eliminated by being able to work with a
slow shutter speed.
10
Without Filter F8 1/50sec.With Variable NDX filter F8 4sec.
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