Canon 300 HS - Manual (Page 88)

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You can lock the exposure and shoot, or set the focus and exposure
separately to shoot. AE stands for “Auto Exposure”
Lock the exposure.
∆ Point the camera toward the subject and
press the
o button while pressing the
shutter button halfway.
When & appears, the exposure will be
set.
∆ If you release your finger from the shutter
button and press the
o button, & will
disappear and the AE will unlock.
Compose the scene and shoot.
Just as with the AE lock, you can lock the exposure for shooting with the flash.
FE stands for “Flash Exposure”.
Choose
h
(p. 71) .
Lock the flash exposure.
∆ Point the camera toward the subject and
press the
o button while pressing the
shutter button halfway.
The flash will fire and when ( appears,
the flash output will be retained.
∆ If you release your finger from the shutter
button and press the
o button, ( will
disappear and the FE will unlock.
Compose the scene and shoot.
Shooting with the AE Lock
Shooting with the FE Lock