Canon EOS-1V HS Instructions Manual page 88

Flash Photography with Speedlite 550EX
1
2
If the subject is too far away resulting in underexposure, the
Get closer to the subject and follow steps 3 and 4.
C.Fn-13-1/3 enables FE lock with the manually-selected focusing point.
C.Fn
(→p.106)
88
Below the viewfinder, the display
shown by 1 appears for 0.5 sec.
followed by the display shown by 2.
4 Compose the shot and take the
picture.
icon will blink.