Canon EOS 1D - Manual (Page 184)

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Whenever you set the power switch to <1/J> or <2>, the Self Cleaning
Sensor Unit operates to automatically shake off any 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.
1
Select [Sensor cleaning].
Under the [7] tab, select [Sensor
cleaning], then press <0>.
2
Select [Clean nowf].
Turn the <5> dial to select [Clean
nowf], then press <0>.
3
Select [OK].
Turn the <5> dial to select [OK],
then press <0>.
X During the sensor cleaning, the
<
f > icon will be displayed on the
LCD monitor. When the cleaning
ends, the screen will return to step 2.
In step 2, select [Auto cleaningf] and set it to [Disable].
X The sensor cleaning will no longer be executed when you set the
power switch to <1/J> or <2>.
f Automatic Sensor Cleaning
Cleaning the Sensor Now
Disabling Automatic Sensor Cleaning
During the sensor cleaning, the shutter will make three shutter-release
sounds. The camera is not taking pictures.
For best results, do the sensor cleaning while the camera bottom is
placed on a table or other flat surface.
Even if you repeat the sensor cleaning, the result will not improve that
much. Right after the sensor cleaning is finished, the [Clean nowf]
option will remain disabled temporarily.
COP
Y