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EF 400mm f/2.8L IS III USM
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Using Power Focus (PF) Mode on the EF 400mm f/2.8L IS III USM lens
Article ID: ART174542
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Date published: 05/29/2019
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Date last updated: 05/30/2019
Description
Using Power Focus (PF) Mode on the EF 400mm f/2.8L IS III USM lens
Solution
Power Focus (PF) Mode
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.
Set the focus preset switch to OFF, and the focus mode switch to PF.
Turn the playback ring manually to change the focus.
You can make a 2-step change in power focus speed, depending on how much the playback ring is turned.
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