Canon EOS 5D Mark III Instruction Manual (en)

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3
 Customizing AF FunctionsN
For the lenses below, which have an electronic focusing ring, you can 
set whether to use the electronic focusing ring.
: Enable after One-Shot AF
After AF operates, if you keep pressing 
the shutter button, you can focus 
manually.
: Disable after One-Shot AF
After AF operates, manual focusing is 
disabled.
OFF: Disable in AF mode
When the lens’ focus mode switch is set to [AF], manual focusing is 
disabled.
23: One Shot
USM lens electronic MF
EF50mm f/1.0L USM
EF300mm f/2.8L USM
EF600mm f/4L USM
EF85mm f/1.2L USM
EF400mm f/2.8L USM
EF1200mm f/5.6L USM
EF85mm f/1.2L II USM
EF400mm f/2.8L II USM
EF28-80mm f/2.8-4L USM
EF200mm f/1.8L USM
EF500mm f/4.5L USM