Buy - ARRI K2.0013887 (K20013887) 4 x 5.65 inch Full Spectrum Neutral Density Filter Available in Eight Densities (0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1, 2.4)
N.D 4x4 Filter Pack 0.3, 0.6, 0.9 - Media Dog Hire
ND Filters – In Depth Guide For Beginners — The School of Photography - Courses, Tutorials & Books
Buy - LEE Filters 4 x 5.65 Inch ProGlass Cine 0.3 Neutral Density Filter (PGC03PV)
What Do The Numbers Printed On Your ND Filter Tell You About The Filter? — Daily Photography Tips