SPEEDLITE 420EZ

One of the first EZ-series flash guns. A good range of features but the Speedlite 430EZ has a higher specification and is a better buy for type B cameras. A-TTL flash mode. Guide number of 42 (ISO 100m) at 80mm zoom head setting. Coverage down to 24mm. Tilt and swivel head for bounce flash.

EOS magazine, December 2003, page 38

Type: energy-saving, automatic, electronic flash unit uses A-TTL metering system to measure light reflected from the film surface. Clip-on type with directly coupled contacts. For exclusive use with EOS camera’s.
Guide number table (at ISO 100):

(The above figures in parentheses indicate the guide numbers in feet at ISO 100)
Flash coverage angle: covers more than the fields of view of 24mm, 28mm, 35mm, 50mm, 70mm and 80mm using auto internal zoom mechanism. Manual switchover possible
Recycling time:

Based on the interval between flash firing and pilot lamp relighting with new alkaline or fully-charged Ni-Cd batteries. (Figures on the left in each column show recycling time for A-TTL mode, and on the right for manual 1/1 mode.
Number of flashes:

Based on flash firing at 30 sec intervals with new alkaline or fully-charged Ni-Cd batteries. (The figures on the left in each column show flashes for manual 1/1 mode, and on the right for A-TL mode)
Flash duration: 1.5 msec or less
X-sync shutter speed:

Flash control system: TTL series control system with preflash function
Flash exposure level control: a maximum of 1.5 BV steps in the A-TTL mode when subject brightness is move then BV5 according to the camera’s metering system
Film speed setting: automatically set by the camera
Automatic shooting distance range:

Based on EF 50mm f1.8 lens at ISO 100. (The automatic shooting distance range extends according to film speed)
Out-of-coupling range warning: if subject is too far away, the shutter speed and the aperture value blink in the viewfinder at the first stroke of the shutter button. If subject is too close, the distance display blinks.
Bounce angle:
Upward; 0-90° (click stop positions at 0, 60, 75, 90)
Left; 0-180° (click stop positions at 0, 60, 75, 90, 120, 150, 180)
Right; 0-90° (click stop positions at 0, 60, 75, 90)
AF auxiliary light: ultra-bright red LED (peak sensitivity: 700mm). Projected at subject for AF flash photography. The effective distance is approx. 0.9-8m (3-26.2ft)
Save-energy function: power automatically turns off after five minutes of non-use when the main switch is left on
Ready lamp: as soon as it glows, the camera automatically switches to flash mode. Yellow-green in the rapid-fire flash status, when sufficiently charged, the colour turns to red. Test firing is possible by pressing the ready lamp after flash charge completion
Power source: four size-AA (LR6) alkaline or Ni-Cd batteries. Carbon-zinc batteries may also be used
Dimensions: 75(W) x 122(H) x 106(D)mm
Weight: 350g without batteries, 450g with batteries