Canon EF70-300mm f/4-5.6 IS II USM Instructions Manual page 5

General Precautions
Shooting Precautions
This lens uses Nano USM as the drive unit for the focus lens (the lens that aligns the focus).
The motor also controls the focus lens during zooming.
1. When the camera is OFF
The motor does not operate while the camera is OFF or when the camera is OFF due to the use of the auto
power off function. Therefore, users must be aware of the following points.
Manual focus adjustments are not possible.
● ●
During zooming, delayed focus will occur.
● ●
2. When the lens is in sleep mode
If not operated for a certain period of time, this lens will enter sleep mode in order to save power. Sleep mode
differs from when the camera is OFF due to the use of the auto power off function.
In this state, the motor will not operate even if the camera is ON. Therefore, users must be aware of the
following points.
Manual focus adjustments are not possible.
● ●
During zooming, delayed focus will occur.
● ●
To exit sleep mode, press the shutter button halfway.
● ●
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