Canon PowerShot A630 PowerShot A640/A630 Camera User Guide Camera User Guide A - Page 45

Shooting Program AE Shooting Mode The camera automatically sets the shutter speed and aperture value to match the brightness of the subject. z When a correct exposure cannot be obtained, the shutter speed and aperture values are shown in red on the LCD monitor when the shutter button is pressed halfway. Use the following shooting methods to obtain the correct exposure and make them show in white. - Using the flash - Changing the ISO speed - Changing the metering method You can change the combinations of shutter speeds and aperture values without altering the exposure (p. 53). Setting the Shutter Speed Shooting Mode When you set the shutter speed, the camera automatically selects an aperture value to match the brightness of the subject. Faster shutter speeds allow you to catch an instantaneous image of a moving subject, while slower speeds create a flowing effect and allow you to shoot without a flash in dark areas. z If the aperture value is shown in red, the image is underexposed (insufficient light) or overexposed (too much light). Use the or button to adjust the shutter speed until the aperture value shows in white. z The nature of CCD image sensors is such that noise in the recorded image increases at slow shutter speeds. This camera, however, applies special processing to images shot at shutter speeds slower than 1.3 seconds to eliminate the noise, thereby producing high-quality images. (However, a certain amount of processing time may be required before the next image can be shot.) 43