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Sigma 28-70mm f/3.5-4.5 UC is a wide-angle to short telephoto lens designed for Nikon F mount cameras with AIS (Auto Indexing Shutter) capabilities. The AIS feature indicates the lens has a prong that will meter couple to older Nikon 35mm manual focus SLR cameras and internal modifications to allow AIS lenses faster and more accurate shutter priority and programmed exposures by way of linear aperture movement. The ultra-compact lens features nine elements in nine groups, six aperture blades, 0.55 meter close focusing distance and 52mm filter thread.