Canon EF 600mm f/4L IS III USM EF600mm f/4L IS III USM Instruction Manual - Page 15

Power Focus PF

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7. Power Focus (PF) By using power focus, you can turn the playback ring to change the focus smoothly. This is a useful feature for changing focus when shooting movies. Focus preset switch Focus mode switch Playback ring Set the focus preset switch to OFF, and the focus mode switch to PF. Turn the playback ring manually to change the focus. OOYou can make a 2-step change in power focus speed, depending on how much the playback ring is turned. ENG-14

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ENG-14
7. Power Focus (PF)
Turn the playback ring
manually to change the
focus.
Set the focus preset switch to OFF, and the focus mode switch
to PF.
Playback ring
Focus preset switch
Focus mode switch
By using power focus, you can turn the playback ring to change the focus smoothly.
This is a useful feature for changing focus when shooting movies.
O
You can make a 2-step change in power focus speed, depending on how much the playback
ring is turned.