Canon Speedlite 420EX Instruction Manual page 50

Major Specifications
Guide No.
[Normal Sync]
Flash Coverage (mm)
Guide No.
[High-speed Sync (FP Flash)]
Sync Speed
1/180
1/250
1/350
1/500
1/750
1/1000
1/1500
1/2000
1/3000
1/4000
• The Guide No. above apply to full flash output.
Recycling Time and Flash Count
Battery Type
Size-AA alkaline batteries
• The above specifications are based on Canon's testing standards.
• Using size-AA nickel-hydride batteries will yield only about 70 to 80
percent of the flashes (1550 mAh at full output) obtainable with size-AA
alkaline batteries. The recycling time will also be about half the time with
size-AA alkaline batteries.
50
24 28
23 25
24 28
12.1 13.1
11.0 12.0
9.7 10.5
8.1 8.8
6.8 7.4
5.8 6.3
4.8 5.3
4.1 4.4
3.4 3.7
2.9 3.1
Recycling Time (sec.)
35 50
31 34
Flash Coverage
35 50
16.3 17.9
14.9 16.3
13.0 14.3
11.0 12.0
9.2 10.1
7.8 8.5
6.5 7.1
5.5 6.0
4.6 5.1
3.9 4.3
Approx. 0.1 - 7.5
(At ISO 100 in meters)
70 105
37 42
(At ISO 100 in meters)
70 105
19.5 22.1
17.7 20.1
15.6 17.7
13.1 14.8
11.0 12.5
9.3 10.5
7.8 8.8
6.5 7.4
5.5 6.2
4.6 5.3
Flash Count
Approx. 200-1400