Rated 5 out of
Ross Chevalier from
Extra creamy movement"When I coach students on long exposures of falls, rapids or white water, one of the desired outcomes is really creamy water. Getting this means very slow shutter speeds and even with low ISO settings and small apertures, the shutter speed you get may not be slow enough for the look you want.
A variable neutral density filter while potentially expensive is a great solution. You can get two stops with just a good quality polarizer but for real slowdown you need more stops, and stacking a bunch of filters on top of each other is a horrible optical compromise.
I have tried the inexpensive variables and they are mostly crap. At deeper densities, they become muddy, cause colour shifts and turn into moire factories. The experience can be so lousy that it can turn people right off.
The Tiffen line is a great choice. It's cost-effective, and certainly less expensive than the superb Heliopan line. I've used the Tiffen extensively and recommend it highly. The only thing I would like to see are the stops as found on the Heliopan, although the difference of $170 more doesn't work for me.
Tiffen Variables come in all the popular sizes plus 82mm to fit the full frame ultrawides. Construction is great and image quality is awesome."