Guide Numbers for the Speedlite 470EX-AI
| Article ID: ART172767 |
| |
Date published: 12/19/2018 |
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Date last updated: 12/19/2018 |
Description
Guide Numbers for the Speedlite 470EX-AI
Solution
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 |
25.0 / 82.0 |
26.0 / 85.3 |
29.0 / 95.1 |
| Quick Flash |
Equivalent to approx. 1/2 - 1/6 of full output |
| Flash Coverage (mm) |
50 |
70 |
80 |
105 |
| Normal Flash (Full Output) |
33.0 / 108.3 |
40.0 / 131.2 |
42.0 / 137.8 |
47.0 / 154.2 |
| Quick Flash |
Equivalent to approx. 1/2 - 1/6 of full output |
| Flash Output |
Flash Coverage (mm) |
| 14 |
24 |
28 |
35 |
| 1/1 |
14.0 / 45.9 |
25.0 / 82.0 |
26.0 / 85.3 |
29.0 / 95.1 |
| 1/2 |
9.9 / 32.5 |
17.7 / 58.1 |
18.4 / 60.4 |
20.5 / 67.3 |
| 1/4 |
7.0 / 23.0 |
12.5 / 41.0 |
13.0 / 42.7 |
14.5 / 47.6 |
| 1/8 |
4.9 / 16.1 |
8.8 / 28.9 |
9.2 / 30.2 |
10.3 / 33.8 |
| 1/16 |
3.5 / 11.5 |
6.3 / 20.7 |
6.5 / 21.3 |
7.3 / 24.0 |
| 1/32 |
2.5 / 8.2 |
4.4 / 14.4 |
4.6 / 15.1 |
5.1 / 16.7 |
| 1/64 |
1.8 / 5.9 |
3.1 / 10.2 |
3.3 / 10.8 |
3.6 / 11.8 |
| 1/128 |
1.2 / 3.9 |
2.2 / 7.2 |
2.3 / 7.5 |
2.6 / 8.5 |
| Flash Output |
Flash Coverage (mm) |
| 50 |
70 |
80 |
105 |
| 1/1 |
33.0 / 108.3 |
40.0 / 131.2 |
42.0 / 137.8 |
47.0 / 154.2 |
| 1/2 |
23.3 / 76.4 |
28.3 / 92.8 |
29.7 / 97.4 |
33.2 / 108.9 |
| 1/4 |
16.5 / 54.1 |
20.0 / 65.6 |
21.0 / 68.9 |
23.5 / 77.1 |
| 1/8 |
11.7 / 38.4 |
14.1 / 46.3 |
14.8 / 48.6 |
16.6 / 54.5 |
| 1/16 |
8.3 / 27.2 |
10.0 / 32.8 |
10.5 / 34.4 |
11.8 / 38.7 |
| 1/32 |
5.8 / 19.0 |
7.1 / 23.3 |
7.4 / 24.3 |
8.3 / 27.2 |
| 1/64 |
4.1 / 13.5 |
5.0 / 16.4 |
5.3 / 17.4 |
5.9 / 19.4 |
| 1/128 |
2.9 / 9.5 |
3.5 / 11.5 |
3.7 / 12.1 |
4.2 / 13.8 |
