Canon Powershot A590 IS User Manual page 77

The aperture value and shutter speed change according to
the zoom state as follows.
Maximum Wide Angle
Maximum Telephoto
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
Aperture Value Shutter Speed (seconds)
f/2.6 – 3.5
f/4.0 – 8.0
f/5.5 – 7.1
f/8.0
75
15 to 1/1250
15 to 1/2000
15 to 1/1250
15 to 1/2000