User manual SIGMA 310

[. . . ] In order to get the maximum performance and enjoyment out of your Sigma lens, please read this instruction booklet thoroughly before you start to use the lens. DESCRIPTION OF THE PARTS (fig. 1) Filter Attachment Thread Focus Ring Distance Scale Depth of Field Read Out Index Focus Index Line Focus Mode Switch Mount Lens Hood manually override the autofocus while the shutter release button is pressed halfway. 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. [. . . ] Please refer to the instruction booklet for your camera body. On the lens mount surface, there are a number of couplers and remove the lens hood so as to avoid cutting off any of the flash output, which could cause a shadow in the picture. 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. Two or more filters and/or special thicker filters, like a polarizing filter, may cause vignetting. When using a polarizing filter with AF camera, use the "circular" type. electrical contacts. To avoid damaging the lens, be especially sure to place the lens with its front end down while changing the lens. Many accessories such as rear mounted teleconverters, extension tubes, etc. , are specially made for designated lenses. Before you purchase such accessories, please check your Sigma lens to determine that it is compatible and that the accessories will function properly with it. BASIC CARE AND STORAGE Avoid any shocks or exposure to extreme high or low temperatures or to humidity. For extended storage, choose a cool and dry place, preferably with SETTING THE EXPOSURE MODE The sigma lens functions automatically after mounting to your camera. Please, refer to the camera instruction book. FOCUSING This lens features Sigma's built-in Hyper Sonic Motor (HSM). SIGMA AF and CANON AF For autofocus operation, set the focus mode switch on the lens to the "AF" position (fig. 2). If you wish to focus manually, set the focus mode switch on the lens to the "M" position. NIKON AF , PENTAX AF, SONY and FOUR THIRDS For autofocus operation, set the camera to AF mode and set the focus mode switch on the lens to the "AF" position (fig. 2). If you wish to focus manually, set the focus mode switch on the lens to the "M" position. (In the case of Four-Thirds cameras it is necessary to switch the camera to MF mode as well) Please refer to camera's instruction manual for details on changing the good ventilation. [. . . ] For Nikon, Pentax and Sony mounts, it is only possible to use AF with camera bodies which support motors driven by ultrasonic waves such as HSM. AF will not function if the camera body does not support this type of motor. [. . . ]