Canon eos rebel t1i - Manual (Page 104)

104
The camera’s mechanical shake caused by the reflex mirror action can
affect images taken with a super telephoto lens or close-up (macro)
lens. In such cases, mirror lockup is effective.
Mirror lockup is enabled by selecting the [7 Custom Functions
(C.Fn)] menu’s [Mirror lockup] and setting it to [1: Enable] (p.187).
1
Focus the subject, press the shutter button completely
and release it.
X The mirror will swing up.
2
Press the shutter button completely again.
X The picture is taken and the mirror goes back down.
Using the self-timer <l> with mirror lockup.
When you press the shutter button completely, the mirror locks up,
then the picture is taken 2 sec. later.
Remote control shooting.
Since you do not touch the camera when the picture is taken, remote
control shooting together with mirror lockup can further prevent
camera shake. With Remote Controller RC-5, pressing the transmit
button locks up the mirror before the shot is taken 2 sec. later. With
Remote Controller RC-1, set it to 2-sec. delay, then shoot.
Preventing Camera ShakeN
Shooting Tips
Do not point the camera toward the sun. The sun’s heat can scorch and
damage the shutter curtains.
If you use bulb exposures, the self-timer, and mirror lockup in combination, keep
pressing the shutter button completely (self-timer delay time + bulb exposure time). If
you let go of the shutter button during the self-timer countdown, there will be a shutter-
release sound. However, this is not the actual shutter release (no picture is taken).
Even if <i> (Continuous shooting) has been set, single shooting will
still take effect.
The mirror locks up, and after 30 seconds, it will go back down automatically.
Pressing the shutter button completely again locks up the mirror again.