Canon EOS Rebel XTi Instruction Manual page 105

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Setting Custom Functions
*
G.Fn-6 Exposure level increments
0:
1/3-stop
1: 1/2-stop
Sets 1/2-stop increments for the sh"utter speed, aperture, exposure
compensation, AEB, etc. Effective when you prefer to control the
exposure in less fine increments.
G.Fn-7 Mirror lockup
0: Disable
1: Enable
Effective for telephoto and close-up shots to prevent camera shake
caused by the mirror's reflex action.
G.Fn-8 E-T'T'1.. II
0: Evaluative
Fully automatic flash photography for all conditions, from low light to
daytime fill-flash. '
1: Average
Geared for advanced users who want to control the external SpeedHte,
this mode averages the entire flash metering area. Since the camera
will not execute automatic exposure compensation, adjust the flash
exposure compensation if necessary.
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