User manual SIGMA 691

[. . . ] Focus Mode ABOUT TELE CONVERTERS Switch (except Nikon The lens can be used with Sigma's 1. 4x EX or 2. 0x EX Apo Tele Converters (optional), becoming a 70-210mm F4 Autofocus telephoto zoom lens or a 100-300mm F5. 6 Autofocus telephoto zoom lens respectively. Do not use other manufacturers' teleconverter's, only those listed above mount) 7. Lens Hood DC LENS These are special lenses that are designated for digital cameras because the lens image circle is designated to correspond to the size of the image sensors of most digital SLR cameras. The specialized design gives these lenses the ideal properties for digital cameras. An image sensor element larger than those corresponding to APS-C are compatible. We recommend the DG APO Tele-Converters when using with DSLR cameras. The Pentax mount Tele Converter is not compatible with this particular lens. In case of Sony AF mount, it is possible to use AF when attaching tele cannot be used in digital cameras or 35mm SLR cameras. [. . . ] (fig. 4) FILTER Only one filter should be used at the time. Two or more filters and/or SETTING THE EXPOSURE MODE The sigma lens functions automatically after mounting to your camera. Please, refer to the camera instruction book. special thicker filters, like a polarizing filter, may cause vignetting. When using a polarizing filter with AF camera, use the "circular" type. BASIC CARE AND STORAGE Avoid any shocks or exposure to extreme high or low temperatures or FOCUSING AND ZOOMING This lens features Sigma's built-in Hyper Sonic Motor (HSM). The HSM enables quick and quiet autofocusing. SIGMA AF and CANON AF For autofocus operation, set the focus mode switch on the lens to the "AF" position (fig. 2). If you wish to focus manually, set the focus mode switch on the lens to the "M" position. You can adjust the focus by turning the focus ring. PENTAX AF and SONY For autofocus operation, set the camera to AF mode and set the focus mode switch on the lens to the "AF" position (fig. 2). If you wish to focus manually, set the focus mode switch on the lens to the "M" position. You can adjust the focus by turning the focus ring. NIKON AF For autofocus operation, set the camera's focus mode to AF. If you wish to focus manually, set the camera's focus mode to "M" and adjust the focus by turning the focus ring. Please refer to camera's instruction manual for details on changing the to humidity. For extended storage, choose a cool and dry place, preferably with good ventilation. To avoid damage to the lens coating, keep away from mothballs or naphthalene gas. Do not use thinner, benzine or other organic cleaning agents to remove dirt or finger prints from the lens elements. [. . . ] This lens also permits manual focusing even in the autofocus mode. With the camera set to the One-Shot AF (AF-S) mode, it is possible to manually override the autofocus while the shutter release button is pressed halfway. When operating this lens in manual focus mode, it is recommended that correct focus be confirmed visually in the viewfinder rather than relying on the distance scale. [. . . ]