Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 440)

3 Custom Function Settings
440
J / K button function C.Fn6
You can change the function of the < J / K >button. During image
playback, you can protect images, record a voice memo, and rate
images.
J / K : Protect (Hold: Record memo)
To protect an image, press the < J / K > button. To start recording a
voice memo, hold down the < J / K > button for approx. 2 sec. To
end the recording, let go of the button.
K : Rec. memo ( J disabled)
Pressing the < J / K > button starts recording a voice memo
immediately, and letting go of the button ends the recording. To
protect an image, use the [
x 1: Protect images ] screen.
7 / K : Play memo (Hold: Rec. memo)
When you play back an image having a voice memo, press the
<
J / K > button to hear the voice memo. To start recording a voice
memo, hold down the < J / K > button for approx. 2 sec. To end the
recording, let go of the button. To protect an image, use the [ x 1:
Protect images ] screen.
9 : Rating ( J and K disabled)
To rate an image, press the < J / K > button. Each time you press
the button, the rating will change as follows: OFF , l , m , n , o ,
p . To protect an image, use the [ x 1: Protect images ] screen.
If [ Rating ( J / K disabled) ] is selected and you press the < Q > button,
you can set the ratings selectable (usable) with the < J / K > button.