The NiSi Filters 150mm System Advance Kit Second Generation II is the ultimate advanved kit for landscape or seascape photographers. It's perfect for anyone who wants to create long exposure images and use ND filters & GND filters and can be combined with any NiSi 150mm holders. This kit is compatible with any NiSi 150mm System holders including the S5 and Q 150mm systems. Included in the kit: NiSi 150x170mm Nano IR Medium Graduated Neutral Density Filter ND8 (0.9) 3 Stop Nisi 150x170mm Reverse Nano IR Graduated Neutral Density Filter ND8 (0.9) 3 Stop Nisi 150x150mm Nano IR Neutral Density filter ND64 (1.8) 6 Stop Nisi 150x150mm Nano IR Neutral Density filter ND1000 (3.0) 10 Stop NiSi Caddy 150mm Filter Pouch Pro for 7 Filters and S5 Filter Holder (Holds 7 x 150x150mm or 150x170mm filters + 150mm Holder) NiSi Clever Cleaner for Cleaning Square Filters150x170mm Nano IR Medium Graduated Neutral Density Filter - ND8 (0.9) - 3 StopThe 150x170mm Nano IR Medium Graduated Neutral Density Filter - ND8 (0.9) - 3 Stop is a rectangular filter that helps to darken specific areas of an image, such as bright skies while allowing for a normal, unaffected exposure in the other regions of the image. The filter is densest at the edge and tapers to clear by the middle, with a medium-edged line of transition between the dense and clear areas. A neutral density filter with a medium-edged line of transition is particularly useful for image