Canon EOS 80D Manual (en)

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When a lens mounted with Power zoom adapter PZ-E1 is attached to a 
supported camera, you can use power zooming in the [Remote Live 
View window].
1
Select the [Live View] tab and click the [PZ] button.
The [Power Zoom Control] window appears.
2
Select the mode from the [Variable speed] tab or 
[Constant speed] tab.
Variable speed mode: Zoom at changeable speeds.
Constant speed mode: Zoom at a constant speed.
Variable speed mode is selected by default.
Power Zoom Operation
80D
Variable speed mode
Constant speed mode
3
Use power zooming.
Variable speed mode
Zooming:
Move the zoom lever toward [W] to zoom to wide-angle.
Move the zoom lever toward [T] to zoom to telephoto.
Changing zoom speed levels:
You can change speeds with the speed level switch.
Setting this to [SLOW] provides a slow zoom, suitable for movie 
shooting.
Setting this to [FAST] provides a faster zoom than [SLOW].
Varying the zoom speed during zooming:
You can adjust the zoom speed with the zoom lever by the amount 
of its movement. Moving the lever slightly left or right provides a 
slow zooming. The more you move the lever to right or left side, 
the more the zoom speed increases.
Zoom lever
Speed level switch