Canon EF 400mm f/2.8L IS III USM EF400mm f/2.8L IS III USM Instructions - Page 16

Manual Focus MF

Page 16 highlights

8. Manual Focus (MF) When shooting images using manual focus (MF), you can select the manual focus speed. Manual focus speed switch Use the manual focus speed switch to select a manual focus speed. Speed is fastest at 1, with 2 and 3 being progressively slower. OOSpeed 3 is recommended for fine focusing. ENG-15

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ENG-15
8. Manual Focus (MF)
When shooting images using manual focus (MF), you can select the manual focus speed.
Manual focus speed
switch
Use the manual focus speed switch to select a manual focus speed.
Speed is fastest at 1, with 2 and 3 being progressively slower.
O
Speed 3 is recommended for fine focusing.