Guide number – Canon MT-26EX-RT Macro Twin Lite User Manual
Page 120
120
Specifications
Guide Number
(ISO 100, in approx. meters/feet)
Normal Flash
High-speed Sync
(at full output)
Flash
Output
Both-sides
Firing
Single-side
Firing
Shutter
Speed
Both-sides
Firing
Single-side
Firing
1/1
26.0/85.3
19.9/65.3
1/125
16.2/53.2
12.4/40.7
1/2
18.4/60.4
14.1/46.3
1/160
15.4/50.5
11.8/38.7
1/4
13.0/42.7
10.0/32.8
1/200
14.4/47.2
11.0/36.1
1/8
9.2/30.2
7.0/23.0
1/250
12.8/42.0
9.8/32.2
1/16
6.5/21.3
5.0/16.4
1/320
11.4/37.4
8.8/28.9
1/32
4.6/15.1
3.5/11.5
1/400
10.2/33.5
7.8/25.6
1/64
3.3/10.8
2.5/8.2
1/500
9.1/29.9
7.0/23.0
1/128
2.3/7.5
1.8/5.9
1/640
8.1/26.6
6.2/20.3
1/256
1.6/5.2
1.2/3.9
1/800
7.2/23.6
5.5/18.0
1/512
1.2/3.9
0.9/3.0
1/1000
6.4/21.0
4.9/16.1
1/1250
5.7/18.7
4.4/14.4
1/1600
5.1/16.7
3.9/12.8
1/2000
4.5/14.8
3.5/11.5
1/2500
4.0/13.1
3.1/10.2
1/3200
3.6/11.8
2.8/9.2
1/4000
3.2/10.5
2.5/8.2
1/5000
2.9/9.5
2.2/7.2
1/6400
2.5/8.2
2.0/6.6
1/8000
2.3/7.5
1.7/5.6