A Neutral
Density (ND) filter like this B&W 110 ND is often needed if
you want to experiment with long exposures, reducing the amount
of light that passes through the lens to the sensor and allowing
you to use slower shutter speeds in your shots. This slowing down
of the shutter lets you capture the motion of flowing water, windswept
grasses or clouds etc. as a blur, which can result in very creative
images.
Using the B+W 110 N is quite an
art – You have to compose and focus shots before adding
the filter, as once it is on you can barely see anything through
the viewfinder (With some cameras it can be left on if
you use with Live View). If you fancy experimenting with
really long exposures it's a fabulous tool, allowing you to use
slow shutter speeds even in full daylight conditions. Very specific,
but good fun!
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