Thank you very much for purchasing a Sigma Lens. In order to get the maximum performance and enjoyment out of your Sigma lens, please read this instruction booklet thoroughly before you start to use the lens. DESCRIPTION OF THE PARTS (fig) ① Filter Attachment Thread Focus Mode Switch Focus Ring Zoom Ring Distance Scale Mount Depth of Field Read Out Index Lens Hood Focus Index Line NIKON AF TYPE CAMERAS This lens functions in the same way as a G Type auto-focus Nikon lens without an aperture ring. Functions maybe restricted depending on the lens/camera combination. For more details, please refer to the camera’s instruction manual.