Canon SPEEDLIGHT 550EX Instructions Manual page 121

G Guide No.
[Normal Mode]
Flash Coverage (mm)
Normal (full) Flash Guide No.
Quick Flash
Manual Flash Guide No.
[High-Speed Sync (FP Flash) ]
Shutter Speed
1/125
1/160
1/180
1/250
1/320
1/350
1/400
1/500
1/640
1/750
1/800
1/1000
1/1250
1/1500
1/1600
1/2000
1/2500
1/3000
1/3200
1/4000
1/5000
1/6000
1/6400
1/8000
(Multiply by 3.3 to convert to feet)
17 24
15 28
Same as for manual flash from 1/2 to 1/6.
1/1 15 28
1/2 10.6 19.8
1/4 7.5 14
1/8 5.3 9.9
1/16 3.8 7
1/32 2.7 4.9
1/64 1.9 3.5
1/128 1.4 2.5
17 24 28
10.6 19.8 21.2
9.4 17.5 18.8
8.8 16.5 17.7
7.5 14.0 15.0
6.6 12.4 13.3
6.3 11.8 12.7
5.9 11.1 11.9
5.3 9.9 10.6
4.7 8.8 9.4
4.3 8.1 8.7
4.2 7.8 8.4
3.8 7.0 7.5
3.4 6.3 6.7
3.1 5.7 6.1
3.0 5.5 5.9
2.7 4.9 5.3
2.4 4.4 4.7
2.2 4.0 4.3
2.1 3.9 4.2
1.9 3.5 3.8
1.7 3.1 3.4
1.5 2.9 3.1
1.5 2.8 3.0
1.3 2.5 2.7
28 35 50
30 36 42
30 36 42
21.2 25.5 29.7
15 18 21
10.6 12.7 14.8
7.5 9 10.5
5.3 6.4 7.4
3.8 4.5 5.3
2.7 3.2 3.7
Flash Coverage (mm)
35 50
25.2 29.7
22.5 26.3
21.2 24.7
18.0 21.0
15.9 18.6
15.2 17.7
14.2 16.6
12.7 14.8
11.3 13.1
10.4 12.1
10.1 11.7
9.0 10.5
8.0 9.4
7.3 8.6
7.1 8.3
6.4 7.4
5.7 6.6
5.2 6.1
5.0 5.9
4.5 5.3
4.0 4.7
3.7 4.3
3.6 4.2
3.2 3.7
Specifications
(At ISO 100 in meters)
70 80 105
46 50 55
46 50 55
32.5 35.4 38.9
23 25 27.5
16.3 17.7 19.5
11.5 12.5 13.8
8.1 8.8 9.7
5.8 6.3 6.9
4.1 4.4 4.9
70 80 105
32.5 35.4 38.9
28.8 31.3 34.4
27.1 29.5 32.4
23.0 25.0 27.5
20.3 22.1 24.3
19.4 21.1 23.2
18.2 19.8 21.7
16.3 17.7 19.4
14.4 15.6 17.2
13.3 14.4 15.9
12.9 14.0 15.4
11.5 12.5 13.8
10.3 11.2 12.3
9.4 10.2 11.2
9.1 9.9 10.9
8.1 8.8 9.7
7.3 7.9 8.7
6.6 7.2 7.9
6.4 7.0 7.7
5.8 6.3 6.9
5.1 5.6 6.1
4.7 5.1 5.6
4.5 4.9 5.4
4.1 4.4 4.9
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