Tv: Setting the Shutter Speed - PowerShot A610, A620, A630 and A640
When you set the shutter speed in the shutter speed-priority AE mode, 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.
1. Turn on the camera, set the mode switch to 
, and turn the shooting mode dial to "Tv".
The shutter speed appears at the bottom of the LCD monitor if it is on.
2. Select a speed using the left or right button.
3. Shoot the image.
The correct exposure has been set if the shutter speed and aperture value show in white.
- If the aperture value shows in red, the image is under exposed (insufficient light) or overexposed (too much light). Adjust the shutter speed using the left and right buttons 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.
|
- Please note that camera shake becomes a factor at low shutter speeds. If the camera shake warning
 blinks in the right corner of the LCD monitor, hold the camera very still, or better yet, secure the camera to a tripod before shooting. Otherwise, blurry images are very likely.
|
The aperture value and shutter speed change according to the zoom state as follows:
| -Lens Zoom Position |
Aperture Value
|
Shutter Speed (in seconds)
|
|
Maximum Wide Angle
|
F2.8 - 3.2
|
15 to 1/1250
|
|
F3.5 - 4.0
|
15 to 1/1600
|
|
F4.5
|
15 to 1/2000
|
|
F5.0 - 8.0*1
|
15 to 1/2500
|
|
Maximum Telephoto
|
F4.1 - 4.5
|
15 to 1/1250
|
|
F5.0 - 6.3
|
15 to 1/1600
|
|
F7.1 - 8.0*2
|
15 to 1/2500
|
*1 In 
, an aperture value of F11 at maximum wide angle may be possible depending on the shooting conditions.
*2 In , an aperture value of F16 at maximum telephoto may be possible depending on the shooting conditions.
The fastest shutter speed for flash synchronization is 1/500 second. The camera automatically resets the shutter speed to 1/500 second if a faster speed is selected.
Shutter Speed Display
The following shutter speeds can be set. 1/160 indicates 1/160 second. Also, 0"3 indicates 0.3 second and 2" indicates 2 seconds.
15" 13" 10" 8" 6" 5" 4" 3"2 2"5 2" 1"6 1"3 1" 0"8 0"6 0"5 0"4 0"3 1/4 1/5 1/6 1/8 1/10 1/13 1/15 1/20 1/25 1/30 1/40 1/50 1/60 1/80 1/100 1/125 1/160 1/200 1/250 1/320 1/400 1/500 1/640 1/800 1/1000 1/1250 1/1600 1/2000 1/2500
You can change the combinations of shutter speeds and aperture values without altering the exposure.
