Haida announces new 2-in-1 circular polarizer and VND filter with independent adjustments: Digital Photography Review
Haida 49/52/58/62/67/72/77/82mm Slim PRO II MC ND 3.0 ND1000x 10 Stop ND Filter | eBay
Amazon.com : Haida 77mm NanoPro Variable Neutral Density 1.2 to 2.7 Filter (4 to 9-Stop) : Electronics
Amazon.com : Haida Ultimate Long Exposure Set 77mm / 82mm Slim PROII Neutral Density MC ND Filter Kit ND8 ND64 ND1000 + Step Ring + Tortoise Case HD4547-82 : Electronics
Haida 77mm NanoPro MC ND 0.9, 1.8, and 3.0 Filter Kit HD4501-77
Neutral Density Filters: Are Haida Filters as good as B+W? | FLOWTOGRAPHY BERLIN TEXT