Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 124)

3 Customizing AF Functions
124
With the following USM and STM lenses equipped with electronic
manual focusing function, you can set whether to use electronic manual
focusing.
* As of June 2016.
: Enable after One-Shot AF
After AF operates, if you keep
pressing the shutter button halfway,
you can adjust the focus manually.
: Disable after One-Shot AF
After AF operates, manual focusing
adjustment is disabled.
OFF: Disable in AF mode
When the lens’s focus mode switch is set to < AF >, manual focusing
is disabled.
2 3: One Shot
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
EF40mm f/2.8 STM EF50mm f/1.8 STM EF24-105mm f/3.5-5.6 IS STM