The NiSi 4 x 4″ Nano IRND 0.9 Filter is an ND filter with an 8x filter factor that provides a 3-stop exposure reduction. Its 0.9 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally Key Features 8x Filter Factor, 3-Stop Darkens Entire Image Allows Reduced Shutter Speed Allows Wider Aperture
