[Pre Order - allow extra time] NiSi 4 x 4" Nano IRND 1.5 Filter (5-Stop, 4mm) 32x Filter Factor, 5-Stop, Darkens Entire Image, Allows Reduced Shutter Speed, Allows Wider Aperture, Neutral Results, Visible, & IR Spectrums, NiSi Optical Nano Coating,...