User manual SIGMA APO 800MM F2.8 EX DG HSM

[. . . ] fOCUSING FOR SIGMA AF , CANON AF and NIKON AF This lens features Sigma’s built-in Hyper Sonic Motor (HSM). 2) (for Nikon AF, select the autofocus mode on your camera body). If you wish to focus manually, set the focus mode switch on the lens to the “M” position. (For Nikon AF, select the manual focus mode on your camera body as you would do normally). [. . . ] Even if you set the focusing ring on the lens to the “M” position, it will rotate automatically when the camera is set in the autofocus mode. There is a possibility that this might damage the motor in the camera. 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 contract. Special allowance is made for this at the infinity setting. ABOUT TELE CONVERTERS The lens can be used with Sigma’s 1. 0x EX (DG) Apo Tele Converters (optional), becoming a 1120mm F8 telephoto lens or a 1600mm F11 telephoto lens respectively (both can be used in manual focus only). Do not use other manufacturers’ teleconverter’s, only those listed above are compatible. We recommend the DG APO Tele-Converters when using with DSLR cameras. It is possible to use auto focus in Live View if the camera is in “contrast detect” AF mode. DG AF FILTER Filters cannot be mounted on the front of the lens. To attach a filter to the lens assembly, please use the filter holder that is inserted into the lens barrel near the rear of the lens assembly. This unit has a removable filter holder that fits a 46mm filter. 594 46mm FILTER HOLDER A normal (clear) filter is already supplied with your Lens Filter Holder. To remove the filter from the lens, first press together the filter holder clip. Then remove the filter holder from the lens barrel. In order to remove the filter, you must hold Ring A in place and then unscrew the filter turning in a counterclockwise direction (fig. To install another filter, you must hold Ring A so that it cannot move and then place your filter in the holder by turning it in a clockwise direction. To re-install the filter holder into the lens barrel, the notation (ø46) must be on the left side of the holder while the lens faces away from you (fig. A Polarizing (PL) filter is supplied with your lens as one of its accessories. The function of this filter is the reduction of undesired reflections that are produced by glass or water surfaces. In addition, it increases the contrast of landscape pictures and darkens blue skies. [. . . ] Do not use thinner, benzine or other organic cleaning agents to remove dirt or finger prints from the lens elements. Clean by using a soft, moistened lens cloth or lens tissue. When using the lens in the rain or near water, prevent it from getting wet. It is often impractical to repair the internal mechanism, lens elements and electric components damaged by water. [. . . ]