Crab Filter Soft GND 0.9 46mm This is a half-ND filter that has a maximum ND8 (3 stoppers) of a half-ND filter that has a neutral effect over half the entire range. Due to the structural, the half-ND position cannot be moved up or down, but the angle can be adjusted by rotating. Made with high quality SCHOTT (Shot) B270 glass. The visible light transmittance is very high, and the ultra-precision polishing ensures high flatness accuracy on both sides.