Manual flash guide number
Maximum guide number (at approx. ISO 100)
Flash output
Unit
Flash coverage
14 mm*
1
24 mm
28 mm
35 mm
50 mm
70 mm
80 mm
105 mm
135 mm
200 mm
1/1
m
14.8
28.7
30.0
36.0
42.7
47.1
49.1
53.9
55.4
60.0
ft.
48.6
94.2
98.4
118.1
140.1
154.5
161.1
176.8
181.8
196.9
1/2
m
10.5
20.3
21.2
25.5
30.2
33.3
34.7
38.1
39.2
42.4
ft.
34.4
66.6
69.6
83.7
99.1
109.3
113.8
125.0
128.6
139.1
1/4
m
7.4
14.4
15.0
18.0
21.4
23.6
24.6
27.0
27.7
30.0
ft.
24.3
47.2
49.2
59.1
70.2
77.4
80.7
88.6
90.9
98.4
1/8
m
5.2
10.1
10.6
12.7
15.1
16.7
17.4
19.1
19.6
21.2
ft.
17.1
33.1
34.8
41.7
49.5
54.8
57.1
62.7
64.3
69.6
1/16
m
3.7
7.2
7.5
9.0
10.7
11.8
12.3
13.5
13.9
15.0
ft.
12.1
23.6
24.6
29.5
35.1
38.7
40.4
44.3
45.6
49.2
1/32
m
2.6
5.1
5.3
6.4
7.5
8.3
8.7
9.5
9.8
10.6
ft.
8.5
16.7
17.4
21.0
24.6
27.2
28.5
31.2
32.2
34.8
1/64
m
1.9
3.6
3.8
4.5
5.3
5.9
6.1
6.7
6.9
7.5
ft.
6.2
11.8
12.5
14.8
17.4
19.4
20.0
22.0
22.6
24.6
1/128
m
1.3
2.5
2.7
3.2
3.8
4.2
4.3
4.8
4.9
5.3
ft.
4.3
8.2
8.9
10.5
12.5
13.8
14.1
15.7
16.1
17.4
1/256*
2
m
0.9
1.8
1.9
2.3
2.7
2.9
3.1
3.4
3.5
3.8
ft.
3.0
5.9
6.2
7.5
8.9
9.5
10.2
11.2
11.5
12.5
1/512*
2
m
0.7
1.3
1.3
1.6
1.9
2.1
2.2
2.4
2.4
2.7
ft.
2.3
4.3
4.3
5.2
6.2
6.9
7.2
7.9
7.9
8.9
1/1024*
2
m
0.5
0.9
0.9
1.1
1.3
1.5
1.5
1.7
1.7
1.9
ft.
1.6
3.0
3.0
3.6
4.3
4.9
4.9
5.6
5.6
6.2
* 1: When using the wide panel
* 2: Not available with high-speed sync
Flash coverage
(focal length; for
35mm full-frame)
14 mm
Wide panel: Manual
* Not compatible with EF15mm f/2.8 Fisheye or EF8-15mm f/4L Fisheye USM
shooting angles of view
24 mm
Zoom
• A: Auto
Flash coverage is set automatically, accounting for [Auto zoom for sensor size]
and [Light distribution] settings at the lens focal length
• M: Manual
Flash coverage is set manually
* [Auto zoom for sensor size] and [Light distribution] settings are not taken into
account
28 mm
35 mm
50 mm
70 mm
80 mm
105 mm
135 mm
200 mm
184
