Canon PowerShot SX170 IS User Guide - Page 111

ç Contents ç Chapter Contents 111 • To reduce the AF frame size, press the button and set [AF Frame Size] on the [4] tab to [Small] (=45). • The AF frame size is set to [Normal] when you use the digital zoom (=59) or digital tele-converter (=109), and in manual focus mode (=108). • To compose shots so that subjects are positioned at the edge or in a corner, first aim the camera to capture the subject in an AF frame, and then hold the shutter button halfway down. As you continue to hold the shutter button halfway, recompose the shot as desired, and then press the shutter button all the way down (Focus Lock). Still Images Movies Face AiAF • Detects people's faces, and then sets the focus, exposure (evaluative metering only), and white balance ([ ] only). • After you aim the camera at the subject, a white frame is displayed around the person's face determined by the camera to be the main subject, and up to two gray frames are displayed around other detected faces. • When the camera detects movement, frames will follow moving subjects, within a certain range. • After you press the shutter button halfway, up to nine green frames are displayed around faces in focus.