User manual SIGMA 669

[. . . ] If such an element is used vignetting will occur on the picture surface. If you use SD14 / SD10 / SD9 digital cameras, corresponding angle of view will be 29-119mm. ATTACHING TO CAMERA BODY When this lens is attached to the camera body it will automatically function in the same way as your normal lens. On the lens mount surface, there are a number of couplers and electrical contacts. [. . . ] Please refer to camera's instruction manual for details on changing the camera's focusing mode. The viewfinder of some Nikon AF cameras have indicators to display the focus status. The " " symbol indicates that correct focus has been set, " " indicates that focus is set in front of the subject, and "" indicates that focus is set behind the subject. When this AF lens is used with Nikon AF cameras in MF mode, please adjust the lens' focus until the " " symbol is visible. To avoid damaging AF mechanism, please do not turn the focus ring manually while in the autofocus mode. 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. This is due to possible focus shift resulting from extreme changes in temperature which cause various components in the lens to expand and contact. Zooming Rotate the Rubber grip on the zoom ring to the desired position. Zoom Lock Switch This lens is also equipped with Zoom Lock Switch to eliminate the zoom creep when the lens is tilted down. Please set zooming ring to 17mm and set the zoom lock switch to the "LOCK" position. (fig. 3) MAGNIFICATION The indication of the lens as "1:xx" on a focusing distance scale represent the magnification (commonly called the reproduction ratio). For example when you are in focus at the "1:2. 3" position on the scale, a subject with an actual size of 2. 3cm will have an image size of 1cm on the firm. (fig. 4) LENS HOOD A bayonet type detachable hood is provided with the lens. This lens hood helps to prevent flare and ghosted images caused by bright illumination from outside the picture area. [. . . ] When you use the lens in the rain or near water, keep it from getting wet. It is often impractical to repair the internal mechanism, lens elements and electric components damaged by water. Sudden temperature changes may cause condensation or fog to appear on the surface of the lens. [. . . ]