Canon EOS REBEL T2I Instruction Manual page 75

,+E_ Automatic Sensor Cleaning
Whenever you set the power switch to <ON> or <OFF>, the Self
Cleaning Sensor Unit operates to automatically shake off the dust on
the front of the sensor. Normally, you need not pay attention to this
operation. However, you can execute the sensor cleaning at anytime as
well as disable it.
Cleaning the Sensor Now
Select [Sensor cleaning].
® Under the [_':] tab, select [Sensor
cJeaning], then press <_>.
Select [Clean now :'c:_].
® Select [CJean now "c],], then press
_ Select [OK] on the dialog screen,
then press <_>.
_ The screen will indicate that the
sensor is being cleaned. Although
there will be a shutter sound, a
picture is not taken.
the sensoi cieaning while the came[a Bottom iS
placed on a table or other flat surface,
{_ Even if you repeat the sensor cleaning, _heresult W!I!not improve that
much, Right after the sensor cleaning iS fin!shed,the [Clean now _[_]
option wi!! rema!n d!sab!ed temporari!Y.
DisabJing Automatic Sensor Cleaning
® In step 2, select [Auto cleaning !rm,] and set it to [Disable].
_y,, T he sensor cleaning will no longer be executed when you set the
power switch to <ON> or <OFF>.
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