The Sigma SA-7 35mm SLR camera was designed with both manual and automatic focus functionality. When you attach a lens with automatic focus capabilities, you can switch from the standard manual focus to allow the camera to focus on the subject of the photograph. This feature is especially useful for photographers new to 35mm SLR cameras, especially if their previous experience taking photographs is with point-and-click digital cameras.
Instructions
1. Line up the red dot on a lens with automatic focus with the red dot on the Sigma SA-7 lens mount and insert the lens. Twist the lens to the right until it clicks into place. The camera's automatic focus function is only compatible with automatic focus lenses.
2. Move the focus switch on the lens from "M" to "AF."
3. Press the "AF" button on the top of the Sigma SA-7 and turn the "C" dial, which is located around the shutter button, to choose "S" for single AF mode or "C" for continuous AF mode. In single AF mode, the subject of the photograph must be in focus in order to take the shot. Continuous AF mode does not require a focused subject, which is useful for motion shots.
4. Frame the subject of the photograph using the viewfinder and press the shutter button halfway. The automatic focus lens will focus on the subject. In single AF mode, release the shutter button and press it halfway again if the camera does not focus on the subject, as indicated by a blinking focus indicator in the viewfinder. The focus indicator will stop blinking when the subject is in focus.
5. Press the shutter button fully to take the picture.
Tags: automatic focus, shutter button, focus subject, Sigma SA-7, single mode, subject photograph
