After much deliberation, confusion, and scratching my head for an weeks on end I made the plunge for the Singh Ray Vari-ND 77mm filter to use in my landscape photography. This filter gives you up to 8 stops, allowing you to blur aspects of motion in your photos. This will work exceptionally well in shooting waterfalls, oceanscapes, and so forth. I decided to go with the Vari-ND rather than the Vari-N-Duo for both price (~$100 difference) and the fact I can mount my thin circular polarizer to it and control glare as needed.
I hope to post a full review on this filter after I get back from Stone Mountain State Park shooting the Cascades and Hidden Falls at that location.
