Canon EOS REBEL T2I Instruction Manual page 46

Notes About the Live View Image
Under low or bright lignt conditions, the Live View image might not reflect
the brightness of the captured image.
If the light source within the image changes, the screen might flicker. If
this happens, stop and resume the Live View shooting under the actual
light source to be used.
It you point the camera in a different direction, it might throw off the Live
View image's correct brightness momentarily. Wait until the brightness
level stabiIizes before shooting.
If there is a very bright light source in the picture, such as the sun me
bright area might appear black on the LCD monitor. However, the actual
captured image v Ill correctly show the brigm area.
In _ow _ight, if you set the [_: LCD brightness] to a bnght setting,
cnromlnance noise may appear _nthe Live View image. However. the
snrom_nance noise will not De recorded in the captured tmage.
When you magnify the image, the image sharpness may look more
pronounced than it really is.
About the <H> icon and camera's internal temperature
increase
When you shoot continuously with the Live View function for a long
aeriod or in high temperatures, the camera's internal temperature may
increase and the <_ > warning icon wili appear on the screen Note that
if you shoot with the Live View function for a tong period in high
temperatures, the <_,_]> warning icon _ui appear earlien Turn off the
camera when not shooting images.
If you shoot with the Live View function while the < _> warning icon is
a_sp/ayed, the image quality of still photos may be degraded. You shouid
stop Live View shooting and allow the camera to rest until the camera s
_nternal temperature decreases.
if Live View shooting continues while the <H > warmng icon is displayea.
_he camera's interna _emperature wil! further increase and Live Vie,_
snooung may stop automatically. Live View shooting will De disabled until
the camera's internal temperature decreases. Turn off the camera and
allow the camera to rest for a while.
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