Canon EOS 620-650 User Manual page 19

When shooting continuously, it is not necessary to focus the same subject again provided you keep pressing the
shutter button halfway after exposure. (To clear, press the shooting mode selector after you remove your finger
from the shutter button.)
[VIEW FINDER INFORMATION]
Correct exposure- Exposure will be correct if continuously lit values display.
Underexposure - Both the shutter speed of 30" and the lens maximum aperture start blinking.
Overexposure - Both the shutter speed of "2000" and the lens minimum aperture start blinking; use an ND
filter.
If it is impossible to get the distance range in focus, the lens minimum aperture value will start blinking.
Exposure, however, will still be correct and you will get the best results under the existing shooting conditions.
(see helpful hints on p. 41)
[Helpful Hints]
1. Move back from the subject and follow steps 2 through 7 again. If
the minimum aperture stops blinking, the distance range will be in
sharp focus and the exposure will be correct.
2. Use a wide-angle lens (or wide-angle side when using a zoom lens)
and follow steps 2 through 7 again. If the minimum aperture stops
blinking, the distance range will be in sharp focus and the exposure will
be correct.
8) Gently press the shutter button completely to take
the picture.