Flash Adjustment - Canon EOS 7 Service Manual

1.16 F A
LASH DJUSTMENT
P :
URPOSE
To adjust the level of the flash sensors for correct flash control.
CAUTION
• Use the standard reflective board (or white wall with less spectral
reflection) in a dark place (EV3 max. or a darkroom) to obtain the average
for several cameras. Make adjustments using these average values.
• Carry out this adjustment if the main flex or flash sensor has been
replaced.
• Before this adjustment, be sure to finish the shutter adjustment and flash
sensor temperature compensation.
• Use the TTL Speedlite (540EZ, 300EZ, etc.) for adjusting TTL, and E-TTL
Speedlite (550EX, 380EX) for adjusting E-TTL.
• If the adjustment value is changed, the shutter may no longer fully close.
So, when the adjustment value has been changed, the flash must be
turned OFF then ON again.
T :
OOLS
EF 50 mm f/1.8 tool lens
Speedlite (already adjusted)
Tripod
Standard reflective chart (Though 18% reflection is preferable, any wall with less
reflection is acceptable.)
S :
TANDARD
Average ±1 EV
P :
REPARATIONS
1) Attach the camera on the tripod, and then attach the EF 50 mm f/1.8 tool lens and
the Speedlight.
2) Set up the camera at distance 2 m from the standard reflective board (or white wall
with less reflection). Manually set the lens to 2.0 m, and TV=1/125, AV=F5.6 in the
manual mode.
Standard reflective board
2.0m
Fig. 4-13 Setup for Flash adjustment
4-29
Part 4: Electrical Adjustment