Guide No. (at ISO 100, in meters/feet)
Normal Flash
Flash
Both Flash
Output
Tubes
1/1
14 / 45.9
1/2
10 / 32.8
1/4
1/8
5 / 16.4
1/16
3.5 / 11.5
1/32
2.5 / 8.2
1/64
1.8 / 5.9
High-speed Sync (1/1 flash output)
Flash
Both Flash
Output
Tubes
1/125
7.9 / 25.9
1/160
7.6 / 24.9
1/200
7.2 / 23.6
1/250
6.8 / 22.3
1/320
6.2 / 20.3
1/400
5.5 / 18
1/500
4.9 / 16.1
1/640
4.4 / 14.4
1/800
3.9 / 12.8
1/1000
3.5 / 11.5
1/1250
3.1 / 10.2
1/1600
2.7 / 8.9
1/2000
2.4 / 7.9
1/2500
2.2 / 7.2
1/3200
1.9 / 6.2
1/4000
1.7 / 5.6
1/5000
1.5 / 4.9
1/6400
1.4 / 4.6
1/8000
1.2 / 3.9
40
MR-14EX
Single
Flash Tube
14 / 45.9
10 / 32.8
7 / 23
7 / 23
5 / 16.4
3.5 / 11.5
2.5 / 8.2
1.8 / 5.9
MR-14EX
Single
Flash Tube
7.9 / 25.9
7.6 / 24.9
7.2 / 23.6
6.8 / 22.3
6.2 / 20.3
5.5 / 18
4.9 / 16.1
4.4 / 14.4
3.9 / 12.8
3.5 / 11.5
3.1 / 10.2
2.7 / 8.9
2.4 / 7.9
2.2 / 7.2
1.9 / 6.2
1.7 / 5.6
1.5 / 4.9
1.4 / 4.6
1.2 / 3.9
MT-24EX
Both Flash
Single
Heads
Flash Head
24 / 78.7
26 / 85.3
17 / 55.8
18.4 / 60.4
12 / 39.4
13 / 42.7
8.5 / 27.9
9.2 / 30.2
6 / 19.7
6.5 / 21.3
4.2 / 13.8
4.6 / 15.1
3 / 9.8
3.3 / 10.8
MT-24EX
Both Flash
Single
Heads
Flash Head
15.9 / 52.2
17.2 / 56.4
14.9 / 48.9
16.2 / 53.1
13.3 / 43.6
14.4 / 47.2
11.9 / 39
12.9 / 42.3
11.5 / 37.7
10.6 / 34.8
9.4 / 30.8
10.2 / 33.5
8.4 / 27.6
9.1 / 29.9
7.5 / 24.6
8.1 / 26.6
6.7 / 22
7.2 / 23.6
5.9 / 19.4
6.4 / 21
5.3 / 17.4
5.7 / 18.7
4.7 / 15.4
5.1 / 16.7
4.2 / 13.8
4.5 / 14.8
3.7 / 12.1
4.1 / 13.5
3.3 / 10.8
3.6 / 11.8
3 / 9.8
3.2 / 10.5
2.6 / 8.5
2.9 / 9.5
2.4 / 7.9
2.6 / 8.5
2.1 / 6.9
2.3 / 7.5