Guide number of different focus length range
GN56 ISO 100 (meters / feet)
-19-
1/1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
24
28
35
50
70
85
20/66
22/72.6
25/82
27/88.6
30/98.3 33/109.2
12.2/40.1 15.3/45.9 17.7/58.1 19.1/62.7 21.9/71.9 24/87.7
8.8/28.9
11/36.1
12.5/41 13.5/44.3 15.5/50.9
17/55.8
6.3/20.7
7.8/25.6 8.8/28.9 9.5/31.2
11/36.1
12/39.4
4.4/14.4
5.5/18
6.3/20.7 6.8/22.3 7.8/25.6 8.5/27.9
3.1/10.2 3.9/12.8 4.4/14.4 4.8/15.7 5.5/18
6/19.7
2.5/8.2
3.2/10.5 3.1/10.2 3.4/11.2 3.9/12.8 4.3/14.1
2.5/8.2
2.7/8.9 3.2/10.5 3.7/12.1 4.4/14.4 4.7/15.4
105
36/118.1
26.2/86
18.5/60.7
13.1/43
9.3/30.5
6.5/21.3
4.6/15.1
5.1/16.7
Coverage(MM)
Flash
output
