Amazon.com : LEE 230942 Square Lens Filter, Half ND, Berry Hard Set, 5.9 x 6.7 inches (150 x 170 mm), for Light Intensity Adjustment, ND0.3/ND0.6/ND0.9, Pack of 3 : Electronics
Everything You Need to Know About Neutral Density Filters
ND Filters – In Depth Guide For Beginners — The School of Photography - Courses, Tutorials & Books
Hoya 52mm Half Neutral Density (ND) x 4 Glass Filter S-52NDH4X
Kenko Half ND Pro filter Half ND 4 with plastic case from Japan! [Near Mint]!! | eBay
ND Filters – In Depth Guide For Beginners — The School of Photography - Courses, Tutorials & Books