Fast-aperture, high performance wide-angle zoom optimized for FX and DX-format sensors and features Nikon’s ED Glass and Nano Crystal Coat. Fast, wide-angle to medium Telephoto AF-S zoom lens optimized for edge-to-edge sharpness on both the Nikon FX (23.9 x 36mm) and DX format image sensors. Internal Focus (IF) provides fast and quiet auto focusing without changing the length of the lens, retaining subject-working distance through the focus range. Rugged construction with professional-grade dust and moisture resistance.