Canon Macro Twin Light MT-26EX-RT Instruction Manual page 103

C.Fn-18:
I
0: LAMP (With focusing lamp button)
Press the <d> button to turn on/off the focusing lamp.
1: J (Half press shutter button twice)
Press the shutter button halfway twice quickly (double-click) to turn
on/off the focusing lamp. This function is convenient when you do
not have a free hand during shooting. You can also switch on/off
the focusing lamp by pressing the <d> button.
If you use AF to focus with this function set to 1, be careful how you
press the shutter button. The focusing lamp may turn on accidentally.
If you use this flash unit with EOS D60 or EOS D30, it will not operate
properly even if you press the shutter button halfway twice quickly
(double-click). Use the <d> button to switch on/off the lamp.
C.Fn-22: (LCD panel illumination)
B
When a button or dial is operated, the LCD panel illuminates. You can
change this illumination setting.
0: 12sec (On for 12 sec.)
1: OFF (Disable panel illumination)
2: ON (Illumination always on)
(Macro: Focusing lamp on/off)
C: Setting Custom Functions
103