Guide no. [normal sync, High-speed sync (fp flash), Recycling time and flash count – Canon Speedlite 420EX User Manual
Page 50: Major specifications
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Guide No.
[Normal Sync]
Major Specifications
(At ISO 100 in meters)
Flash Coverage (mm)
24
28
35
50
70
105
Guide No.
23
25
31
34
37
42
[High-speed Sync (FP Flash)]
(At ISO 100 in meters)
Sync Speed
Flash Coverage
24
28
35
50
70
105
1/180
12.1
13.1
16.3
17.9
19.5
22.1
1/250
11.0
12.0
14.9
16.3
17.7
20.1
1/350
9.7
10.5
13.0
14.3
15.6
17.7
1/500
8.1
8.8
11.0
12.0
13.1
14.8
1/750
6.8
7.4
9.2
10.1
11.0
12.5
1/1000
5.8
6.3
7.8
8.5
9.3
10.5
1/1500
4.8
5.3
6.5
7.1
7.8
8.8
1/2000
4.1
4.4
5.5
6.0
6.5
7.4
1/3000
3.4
3.7
4.6
5.1
5.5
6.2
1/4000
2.9
3.1
3.9
4.3
4.6
5.3
• The Guide No. above apply to full Hash output.
Recycling Time and Flash Count
Battery Type
Recycling Time (sec.)
Flash Count
Size*AA alkaline batteries
Approx. 0.1 - 7.5
Approx. 200-1400
Size-AA Ni-Cd batteries
Approx. 0.1 *4.5
Approx. 80-600
The above ligures are based on Canon's testing conditions with a new set of batteries.
50