User manual SIGMA 485

[. . . ] Depending on the combination with camera some restrictions with its functions may result. For more details, please refer to instruction manual of the camera in use etc. PENTAX AF TYPE CAMERAS This Lens functions same as a FAJ Type (type without Aperture) auto-focus Pentax lens. Depending on the combination with camera some restrictions with its functions may result. [. . . ] Select the autofocus mode on your camera body (set the focus mode switch on the lens to "AF" for Sigma SA and Canon AF lens). In the autofocus mode, your camera will set the focus automatically. While auto focusing, please do not touch the focus ring around the lens. To avoid damaging AF mechanism, please do not turn the focus ring manually while in the autofocus mode. This lens has a very deep depth of field, despite its short focal length. Although your lens performs precise autofocusing, this feature might cause the lens' distance scale to show a different reading than the real subject - to - lens distance. Manual Focus You can set the focus by turning the focus ring. When you focus manually with AF lens, select the manual focus mode on your camera body (set the focus mode switch on the lens to "M" for Sigma SA and Canon AF lens). 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. 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. PREVENTION OF FLARE AND GHOST Because of the extremely wide angle of view of this lens, flare and ghosting may occur much more easily than with other lenses. When you take a picture with this lens, please pay special attention to flare and ghosting which can occur when shooting near or directly into the sun or other very bright lights. DEPTH OF FIELD SCALE The depth of field scale helps you to check the depth of field (the zone of sharpness) of your composition. For example in figure (3), the depth of field zone is shown when the aperture F5. 6 is used. INFRARED PHOTOGRAPHY When photographing using infrared film and infrared filters an adjustment to focus must be made. [. . . ] 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. [. . . ]