User manual SIGMA 853

[. . . ] If such an element is used vignetting will occur on the picture surface. If you use SD14 or SD10 or SD9 digital camera, corresponding angle of view will be 30-212mm. 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 set zooming ring to 18mm and set the zoom lock switch to the "LOCK" position. (fig. 2) 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 "1:3. 8" position on the scale, a subject with an actual size of 3. 8cm will have an image size of 1cm on the firm. (fig. 3) ABOUT OS (OPTICAL STABILIZER) FEATURES This OS lens effectively compensates for image blurring caused by camera shake. Using the Optical Stabilizer function it is possible to get sharp results at shutter speeds approximately 3-4 stops slower than you could without using the OS function. Press the shutter button halfway down, confirm the image in the viewfinder is stable then take the picture. (It takes approximately 1 second to produce a stable image from the time of depressing the shutter button halfway). Sony and Pentax fittings are not equipped with the Optical Stabilizer (OS) function. Do not use the Optical Stabilizer in the following situations: When the lens is mounted on a tripod. If the OS lens is attached to your camera and activated, shooting capacity of your camera will be lower than with conventional lenses used with the same camera. If you are not using OS, please turn OFF the OS switch, in order to prevent unnecessary battery consumption. Be sure to turn the OS switch to the OFF position before attaching or detaching the lens to the camera. The OS continues to operate after you release your finger from the shutter button, as long as the exposure meter displays the exposure value. Never remove the lens or remove the camera's battery while the image stabilizer is operating as this could damage the lens. Although the viewfinder image may appear to shake immediately after shooting and/or at the start of the flash charge cycle of the camera's built-in flash, it will not cause any effect to the pictures. If the lens is detached from camera or the camera power is turned off while the OS function is in operation, the lens may emit a chattering noise, but this is not a malfunction. LENS HOOD A bayonet type detachable hood is provided with the lens. [. . . ] 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. [. . . ]