Polariser yes or no?

they typically reduce light levels by 2 stop which can also make them really useful as an ND filter to create some motion in shots - 2 filters for the price of one:thumbs:

Simon

There's that as well! (Althought the Hoya HD only reduces by about 1 stop.)

It can make all the difference when you're trying to get silky-look waterfalls, for example.
 
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