Canon EOS-1V Service Manual page 88

Part 4: Electrical Adjustments
1.20 F
LASH
This consists of the basic adjustments and level adjustments of TTL and E-TTL. The
basic adjustment mainly adjusts the gain when the ISO changes. The level adjustment
adjusts the exposure level when flash is used.
CAUTION
TOOLS
EF 50mm f/1.8 tool lens
Speedlite (TTL models like 300EZ, 540EZ)
Tripod
Standard 18-percent gray card (or a low-reflectance wall)
Flash meter or the EF-8000 or EF-5000's direct light metering sensor
SET-UP FOR MEASUREMENT
As shown, place the camera 2 m
from the standard 18-percent gray
card (or low-reflectance white wall).
When measuring for E-TTL, the
measured value will not be different
for manual focus and autofocus.
When measuring TTL, one of the
three metering sensors is selected in
correspondence to the focusing
point's position. Therefore, set the
lens to AI Servo (it does not need to
be in focus). To measure the left
metering sensor, select the left
focusing point. To measure the right
metering sensor, select the right
focusing point. To measure the cen-
ter or peripheral metering sensor,
select the center focusing point.
M A
ETERING DJUSTMENT
• When adjusting TTL, use a TTL Speedlite (540EZ, 300EZ, etc.). When
adjusting E-TTL, use an E-TTL Speedlite (550EX, 380EX, etc.). If the
wrong type of Speedlite is used, the adjustment cannot be made.
• After performing the basic adjustments for TTL and E-TTL (A-TTL adjust-
ment is usually not necessary), do the level adjustment.
• In a dark place (EV 3 or lower or in a darkroom), use a standard 18-per-
cent gray card (or a white wall with low reflectance) and obtain readings
from several units and average the results. Use the average as the center
value. Take each reading under the same conditions.
• After replacing the main flexible board, adjust the TTL and E-TTL. After
the front panel unit (with built-in TTL sensor) is replaced, only TTL needs
to be adjusted.
• Before adjusting TTL and E-TTL, the shutter adjustment must be completed.
• Before adjusting E-TTL, the Basic AE Adjustments must be completed.
• The EF-8000 or EF-5000's direct light metering sensor can be used as a
flash meter to obtain accurate readings.
2.0m
Fig. 4-14 Flash metering set-up.
4-34
Standard 18-percent gray card