"MODE" button to cycle through the choices until you see "M" mode
Once in Manual mode, you can adjust the flash intensity to one of six power levels by pushing the
"+" or the "-" button until the desired power level is displayed on the LCD:
z
1/1 Full power for M mode
z
1/2
z
1/4
z
1/8
z
1/16
z
1/32 Minimum power for M mode
Use a handheld flash meter to determine the power setting which will produce correct flash
exposure. If you do not have a flash meter, you can get an approximate idea using simple Guide
Number calculations:
a) Measure the flash-to-subject distance
e.g. 2 metres
b) Multiply the flash-to-subject distance by the aperture setting on your lens
e.g. for f/11, multiply by eleven
c) Express the product as a fraction of the Guide number of the flash. For ISO 100, the guide
number is 43m.
e.g. 2 m times 11 equals 22m, which is very close to half of the Guide number for the flash,
43m
d) Set your flash power to the result fraction
e.g. 1/2 power
e) Check your result. Usually, some adjustment is required, since the actual guide number may
differ from the value specified as ideal.
When using a Digital SLR, check your histogram to make sure that highlights are not blown
out.
f) A new setting is required only if you change the aperture or the flash-to-subject distance.
Synchronization
The flash is normally synchronized to the OPENING of the shutter. If you wish to synchronize
flash to just before the CLOSING of the shutter, select "2nd curtain sync" by pushing the "+" and
the "-" buttons together.
"2nd curtain sync" is indicated on the LCD panel by a symbol with three triangles.
Stroboscope
The flash normally emits a single burst of light during each exposure. For special effect
photography, such as multiple exposures to show a sequence of motion, you can cause the
Speedlite to emit several bursts of light.
A-TTL ->
M
-> M MULTI ->
Guide Number
(ideal)
ISO
24mm 28mm 35mm 50mm 70mm 80mm
100/21°
25 m
27 m
30 m
35 m
40 m
43 m
200/24°
35 m
30 m
42 m
50 m
57 m
60 m
400/27°
50 m
34 m
60 m
70 m
80 m
86 m
800/30°
70 m
60 m
84 m
100 m
114 m
120 m
Pagina 4 di 8
EOS Documentation - 430EZ