Reference Guide

4
The 430 EZ Internal Zoom Mechanism:
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M Zoom
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fig . 4
Automatic Zoom Setting: The flash head position automatically
adjusts to lens focal length from 24mm to 80mm when the camera
shutter release is pressed halfway. "A Zoom" (fig. 2) appears on
the display panel.
Manual Zoom Setting: Press the "Zoom" button (fig. 3) and the
display will change to "M Zoom" (fig. 4). Press the "Zoom" button
again to advance through the available settings of 24, 28, 35,
50, 70, and 80mm. To return to Automatic, press the "Zoom "
button until "A Zoom" appears on the display panel.
Note: The Mode Memory Function will memorize the mode and set
values as the 430 EZ is turned OFF, eliminating the need for
resetting.
430 EZ FLASH EXPOSURE MODES
A-TTL Mode: This is the standard automatic flash exposure mode of
the 430 EZ. It can be used in all camera exposure modes EXCEPT
Manual and Bulb. A-TTL's unique feature is a small pre-exposure
flash burst which is used to measure approximate flash-subject
distance. The camera uses this information in different ways
depending on the exposure mode.
1. Program Mode: The camera sets both shutter speed and
aperture value. Shutter speeds range from 1/60 to either 1/125 or
1/250, depending on the camera. Aperture value is set based on a
comparison of subject distance vs. available light level.
Automatic fill-flash occurs in this mode ONLY at light levels of
EV 10 or higher.
2. Shutter Priority or Aperture Priority: The photographer
sets shutter speed OR aperture value. IN THESE MODES, THE 430 EZ
ACTS AS A FILL-IN FLASH AT ALL TIMES. IN FILL-IN FLASH, THE
AVAILABLE LIGHT EXPOSURE MUST BE CORRECT. AS A RESULT, THE CAMERA
SETS LONG SHUTTER SPEEDS OR WIDE APERTURES IN LOW LIGHT, TO
PROVIDE CORRECT EXPOSURE OF THE AVAILABLE LIGHT.
TTL Mode: This mode provides automatic flash exposure when the
camera is used in its Manual Mode. TTL mode on the 430 EZ can be
set with the EOS-1, EOS 620/630/650, and the T90 only. With all
these cameras except the T90, the 430 EZ will display usable
distance ranges based on aperture and focal length selection when
the shutter release is pressed halfway (Direct Flash only, not
Bounce Flash).