Canon PowerShot SD900 PowerShot SD900 / DIGITAL IXUS 900 Ti Camera User Guide - Page 49
Shooting Hard-to-Focus Subjects, Focus Lock, AF Lock
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Shooting - The camera may mistakenly identify non-human subjects as a face. If this occurs, switch to the [On] or [Off] options. - When a face is not detected, images will be shot using the [On] option. z In [Face Detect] mode, faces may not be detected under the following circumstances. - If the face appears small, large, dark or bright relative to the overall composition. - If the face is turned horizontally or diagonally, or if a portion is obscured. Shooting Hard-to-Focus Subjects (Focus Lock, AF Lock) Shooting Mode It may be difficult to focus on the following types of subjects. zSubjects with extremely low contrast to the surroundings zScenes with a mixture of near and far subjects. zSubjects with extremely bright objects at the center of the composition zSubjects that are moving quickly zSubjects through glass: Try to shoot as close to the glass as possible to reduce the chances of light reflecting back off the glass. Shooting with the Focus Lock The focus lock can be used in any shooting mode. 1 Aim the camera so that an object at the same focal distance as the main subject is centered in the viewfinder or in the AF frame displayed on the LCD monitor. 2 Press the shutter button halfway to set the focus. 3 Keep the button pressed, re-aim the camera to compose the shot as desired and press the shutter button fully. 47