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Canon 420EZ Speedlite
Additional information relating to Canon Speedlite 420EZ

Designed exclusively for Canon EOS cameras back in the late '80 (1987, to be exact), it was also once used to be Canon top flash model for the EOS cameras. This dedicated automatic flash features an auto internal zoom mechanism that matches the flash coverage of the lens in use from 24mm to 80mm. The 420EZ has automatic A-TTL operation - the EOS camera measures the ambient light and fires a near-infrared preflash to determine flash-to-subject distance and set the aperture. Then, during exposure, SPC photocells measure the light reflected on the film plane and control the flash output for perfect flash exposure balanced with the background light. The 420EZ also features a Rapid Fire Flash System with a recycling time of 1.5 sec.

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The Speedlite offers a choice of 1st or 2nd curtain sync. flash for creative special effects with flash/time exposures. An AF auxiliary light flashes under low light conditions - onto a subject up to 26 feet away for sure autofocus, even in total darkness. The 420EZ has a Guide Number of 116 (ISO 100, feet a 50mm coverage angle). Manual operation is possible at full, 1/2, 1/4, 1/8, 1/16,, or 1/32nd power settings. A large LCD panel provides full flash information with touch-button controls. A special Stroboscopic flash feature produces from 2 to 5 special effect flashes per second for recording onto a single-frame image.

Front view of Canon 420EZ AF speedlite

LCD rear of  420EZ AF speedlite

Rear section Canon 420EZ

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Type: Energy-saving, automatic, electronic flash unit using A-TTL metering system to measure light reflected from the film surface. Clip-on type with directly coupled contacts. For exclusive use with EOS cameras.
Guide Number Table (at ISO 100):
Zoom position (mm)   24 28 35 50 70 80
Normal flash   25(83) 27(90) 30(100) 35(116) 40(133) 42(140)
Rapid Fire Flash

1/2 to 1/16 of that for normal flash

Manual Flash

Also refer table below
1/1 25 83) 27(90) 30(100) 35(116) 40(133) 42(140)
1/2 17.7 (59) 19.1(63) 21.2 (70) 24.7 (82) 28.3 (94) 29.7 (99)
1/4 12.5 (41) 13.5 (45) 15 (50) 17.5 (58) 20 (66) 21 (70)
1/8 8.8 (29) 9.5 (31) 10.6 (35) 12.4 (41) 14 (47) 14.8 (49)
1/16 6.3 (21) 6.8 (23) 7.5 (25) 8.8 (29) 10 (33) 10.5 (35)
1/32 4.4 (14) 4.8 (16) 5.3 (17) 6.2 (20) 7.1 (23) 7.4 (24)

Note: (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 switch over possible.

Recycling Time:
  Alkaline Ni-Cd
Normal flash approx. 0.2 to 13 sec approx. 0. 2 to 6.5 sec
Rapid-fire flash approx. 0.2 to 1.5 sec approx. 0.2 to 1 .5 sec

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:
. Alkaline Ni-Cd
Normal flash approx. 100 to 2000 approx. 45 to 300

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 ill mode, and on the right for A-TTL mode.)
Flash Duration: 1.5 msec or less

X-sync Shutter Speed:
  EOS 620 Setting
P 1/60-1/250 sec Automatic
Tv 30-1/250 sec Manual
Av 30-1/250 sec Automatic
M 30-1/250 sec Manual
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 more than BV5 according to the camera's metering system.
Film Speed Setting: Automatically set by the camera. Automatic Shooting Distance Range:

A-TTL normal flash approx., 0.7 to 21 m (2.3 to 68.8 ft.)
A-TTL rapid-fire flash (min.) approx. 0.7 to S m (2.3 to 16.4 ft.)
A-TTL rapid-fire flash (max.) approx. 0,7 to 16 m (2.3 to 52 4 ft.)

Based on EF 50mm f/1.8 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.

Canon 420EZ flash nomancluture
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: 700nm). Projected at subject for AF flash photography. The effective distance is approx. 0.9-8m (3-26.2 ft.)
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 color 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 (2-15/16" x 4-13/16" x 4-3/16")
Weight: 350g (12-3/8 oz.) without batteries, 450g (15-7/8 oz.) with batteries

Side view of Canon 420EZ AF speedlite
Flash Photography:- Index Page Part | 2 | 3 | 4 - Canon 540EZ site

Selective Canon TTL Flash Models:- 160E | 200E | 300EZ | 300TL | 420EZ | 430 EZ | 480EG | 540EZ | Macrolite | Other non-TTL Canon flash models Useful Resources at Julian Loke site: - Instruction Manual(s (PDF) for Canon 420EX | 580EX AF-TTL Speedlites. Suggestive weblink:- Canon Flash Resources at or Bob Atkin Flash FAQ section

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Background and Various Issues | The Basic Features & various Setup | Manual & Auto Focusing | Metering Systems | Exposure Control | Viewfinder optical System | Flash Photography (with Speedlite 540EZ extension) Reliability Issues:- Body Chassis | Shutter Unit | Electronic Circuitry | Film Transport & film handling Secondary Functions:- Custom Function System Accessories:- Film Back Options | Macro/Close Up| Power Sources - BP-E1 | PDB-E1 | Focusing Screens| Remote Control| System compatibility Canon EOS-1N - Variants Canon EOS-1N RS | Canon/Kodak Digital DCS-1, 3 -5 & 520/560 Series (includes Canon D2000 - Instruction Manual links provided) Full Technical Specification | Main Reference Map / Nomenclature

Resource Centre
:- Comparative Charts between EOS-1 & EOS-1N / or with its active Competition(s) (Nikon); Quick Operational Reference Card (278k Gif File); Listings of 7-segment digital numbers/letters appeared on LCD display panel/viewfinders (HTML page); External Link:-Instruction Manual (3.3MB PDF file applicable for both Canon EOS-1N (RS)

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