User manual SIGMA 201

[. . . ] An image sensor element larger than those corresponding to APS-C cannot be used in digital cameras or 35mm SLR cameras. If such an element is used vignetting will occur on the picture surface. If you use SD14, SD10 or SD10 digital cameras, corresponding angle of view will be 17-34mm. 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. [. . . ] (for Nikon AF, select the manual focus mode on your camera body as you would do normally) (For Four-Thirds, select the manual focus mode on your camera body and set the focus mode switch on the lens to the "M" position). You can adjust the focus by turning the focus ring. This lens also permits manual focusing even in the autofocus mode. With the camera set to the One-Shot AF (AF-S) mode, you can adjust focus manually after the lens autofocus (and stops), while the shutter button is pressed halfway. (In the case of Four-Thirds fitting, the setting method varies depending on the camera body. Please follow the instruction manual of your camera body. ) 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. Special allowance is made for this at the infinity setting. FOR SONY AF AND PENTAX 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 "MF" and adjust the focus by turning the focus ring. 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. Special allowance is made for this at the infinity setting. ZOOMING Rotate the Rubber grip on the zoom ring to the desired position. 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. Attach the hood and turn clockwise until it stops rotation. (fig. 3) In order to place the lens and hood into the storage case, you must first remove the hood, then replace it on the lens in the reverse position. [. . . ] 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. [. . . ]