Haida Wide Angle Variable Neutral Density Filters is made of special selected optical material, by rotating the frame, the density could be easily adjusted from ND2 (ND0.3) to ND1000 (ND3.0).The premium special neutral optical material guarantee no color cast would occur when adjusting. Original wide angle design just acts as the same effect as the ultra slim filter frame to eliminate "ghosting". The upside part of frame is made of premium alloy material with special non-reflection treatment, the under part is in bright dark. The whole filter looks so kingly. The special processing techniques guarantee the steady rotating function in any temperatures from -40 to 80. Warmly remind you that because of physical properties and light changes in different circumstances,sometimes slight crossbar shadow may occur, please decrease the neutral density till it disappear, then taking pictures.