Guide number – Canon Speedlite 430EX III-RT User Manual
Page 101
101
Specifications
Guide Number
(ISO 100, in approx. meters/feet)
Normal Flash (Full Output)/Quick Flash
Flash Coverage (mm)
14
24
28
35
Normal Flash (Full Output)
14.0 / 45.9
22.0 / 72.2
24.0 / 78.7
28.0 / 91.9
Quick Flash
Same as approx. 1/2 - 1/3 of full output
Flash Coverage (mm)
50
70
80
105
Normal Flash (Full Output)
33.0 / 108.3 40.0 / 131.2 41.0 / 134.5 43.0 / 141.1
Quick Flash
Same as approx. 1/2 - 1/3 of full output
Manual Flash
Flash Output
Flash Coverage (mm)
14
24
28
35
1/1
14.0 / 45.9
22.0 / 72.2
24.0 / 78.7
28.0 / 91.9
1/2
9.9 / 32.5
15.6 / 51.2
17.0 / 55.8
19.8 / 65.0
1/4
7.0 / 23.0
11.0 / 36.1
12.0 / 39.4
14.0 / 45.9
1/8
5.0 / 16.4
7.8 / 25.6
8.5 / 27.9
9.9 / 32.5
1/16
3.5 / 11.5
5.5 / 18.0
6.0 / 19.7
7.0 / 23.0
1/32
2.5 / 8.2
3.9 / 12.8
4.2 / 13.8
5.0 / 16.4
1/64
1.8 / 5.9
2.8 / 9.2
3.0 / 9.8
3.5 / 11.5
1/128
1.2 / 3.9
1.9 / 6.2
2.1 / 6.9
2.5 / 8.2
Flash Output
Flash Coverage (mm)
50
70
80
105
1/1
33.0 / 108.3 40.0 / 131.2 41.0 / 134.5 43.0 / 141.1
1/2
23.3 / 76.4
28.3 / 92.8
29.0 / 95.1
30.4 / 99.7
1/4
16.5 / 54.1
20.0 / 65.6
20.5 / 67.3
21.5 / 70.5
1/8
11.7 / 38.4
14.1 / 46.3
14.5 / 47.6
15.2 / 49.9
1/16
8.3 / 27.2
10.0 / 32.8
10.3 / 33.8
10.8 / 35.4
1/32
5.8 / 19.0
7.1 / 23.3
7.3 / 24.0
7.6 / 24.9
1/64
4.1 / 13.5
5.0 / 16.4
5.1 / 16.7
5.4 / 17.7
1/128
2.9 / 9.5
3.5 / 11.5
3.6 / 11.8
3.8 / 12.5