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Cop y – Canon EF 200-400mm f4L IS USM Extender 1.4x User Manual

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6. Power Focus (PF) Mode

Using the playback ring enables smooth focus change.

This is a useful feature for changing focus when shooting movies.

When the playback ring is rotated in a certain direction, focus changes in the same direction as

when the focusing ring is rotated.

You can make a 2-step change in focus shift speed depending on the angle that the playback ring is

rotated to.

With the focus preset switch set to OFF, set the focus mode

switch to PF.

Rotate the playback ring to

change the focus.

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