Canon PowerShot G9 User Manual page 97

The nature of CCDs 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).
The aperture value and shutter speed change according to
the zoom state as follows.
Maximum Wide Angle
Maximum Telephoto
* Depending on the shooting conditions, the aperture value can increase to
f/11 in .
The fastest shutter speed for built-in flash synchronization is
1/500 second. The camera automatically resets the shutter
speed to 1/500 second or slower, if a faster speed is
selected.
Shutter Speed Display
The numbers in the table below indicate the shutter speed in
seconds. 1/160 indicates 1/160 second. Also, quote marks
indicate the decimal place, so that 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 (p. 129).
Shooting Using the Mode Dial
Aperture Value Shutter Speed (seconds)
f/2.8
f/3.2 – 3.5
f/4.0 – 8.0*
f/4.8
f/5.6 – 6.3
f/7.1 – 8.0*
95
15 to 1/1600
15 to 1/2000
15 to 1/2500
15 to 1/1600
15 to 1/2000
15 to 1/2500