Guide no. [normal sync, High-speed sync (fp flash), Recycling time and flash count – Canon 420EX User Manual
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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
163
179
195
22 1
1/250
11 0
120
149
163
177
20 1
1/350
9 7
10 5
130
143
15.6
177
1/500
8 1
68
11 0
120
13 1
148
1/750
68
7.4
92
10 1
11 0
125
1/1000
56
6.3
78
8 5
93
10 5
1/1500
48
53
65
7 1
78
88
1/2000
4 1
44
55
60
65
74
1/3000
34
3.7
46
5 1
55
62
1/4000
29
3 1
39
43
46
53
• The Guide No, above apply to full flash 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 figures are based on Canon's testing conditions with a new set of batteries.
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