Using Power Focus (PF) Mode on the EF 400mm f/4 DO IS II USM lens

Article ID: ART174573 | Date published: 05/30/2019 | Date last updated: 05/30/2019
 

Description

Using Power Focus (PF) Mode on the EF 400mm f/4 DO IS II USM lens

Solution

Power Focus (PF) Mode

Using the playback ring enables smooth focus change.
This is a useful feature for changing focus when shooting movies.*1

With the focus preset switch set to OFF, set the focus mode switch to PF.
Rotate the playback ring to change the focus.
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.

*1 Power focus (PF) will work while a Live View image is displayed on the camera or when shooting movies for the following cameras:
EOS-1D X, EOS 5D Mark III, EOS 6D, EOS 70D, EOS REBEL T5i/700D, SL1/100D, T4i/650D, T5/1200D.
EOS M2*2 and EOS M when used together with Mount Adapter EF-EOS M.
*2 Not available in certain countries and regions.

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