Canon PowerShot S40 PowerShot S40/S30 Camera User Guide - Page 68

Setting the Shutter Speed When you set the shutter speed in the shutter speed-priority AE mode, the camera automatically selects an aperture setting to match the brightness. 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. 1 Turn the shooting mode dial to . • The shutter speed appears on the LCD monitor if it is on. 2 Select a speed using B or A on the multicontroller. 3 Shoot the image. • The correct exposure has been set if the shutter speed and aperture settings show in white. • If the aperture value shows in red, the image is under- or overexposed (insufficient light). Adjust the shutter speed using B or A on the multicontroller until the aperture value display turns to white. • 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. Nevertheless, a certain amount of processing time may be required before the next image can be shot. 66 Shooting - Selecting Particular Effects