[Pre Order - allow extra time] NiSi 4 x 4" Nano IRND 1.8 Filter (6-Stop, 4mm) 64x Filter Factor, 6-Stop, Darkens Entire Image, Allows Reduced Shutter Speed, Allows Wider Aperture, Neutral Results, Visible, & IR Spectrums, NiSi Optical Nano Coating,...