Guide Number of different focal length range (at ISO 100, in meters / feet)
Flash Coverage (mm)
Flash Output
14 24
28 35 50 70 80 105
1/1
15/49.2 28/91.9 30/98.4 39/127.9 42/137.8 50/164
53/173.9 58/190.3
1/2
10.6/34.8 19.8/65 21.2/69.6
27.6/90.7
29.7/97.4 35.4/116.1
37.5/123 41/134.5
1/4
7.5/24.6 14/45.9
15/49.2 19.5/64 21/68.9 25/82
26.5/86.9
29/95.1
1/8 5.3/17.4
9.9/32.5
10.6/34.8
13.7/45.2
14.8/48.6
17.7/58.1
18.7/61.4
20.5/67.3
1/16
3.8/12.5 7/23
7.5/24.6 9.7/32 10.5/34.4
12.5/41 13.3/43.6
14.5/47.6
1/32
2.7/8.9 4.9/16.1
5.3/17.4 6.9/22.7 7.4/24.3 8.8/28.9 9.4/30.8 10.3/33.8
1/64
1.9/6.2 3.5/11.5
3.8/12.5 4.9/16 5.3/17.4 6.3/20.7 6.6/21.7 7.3/24
1/128
1.3/4.3 2.5/8.2 2.7/8.9 3.5/11.4 3.7/12.1 4.4/14.4 4.7/15.4 5.1/16.7
IX. Possible problems during use and solutions
1. Please note when use the flash outdoors:
For outdoor application, please avoid direct sunlight to the wireless
triggering sensor and ensure normal use of the flash.
2
．
Precaution for outdoor use of lambency umbrella:
The lambency umbrella mounted on the flash light
outdoors may be blown down easily, and the hot shoe of the flash light may be broken. Please fix the mounting
rack or avoid outdoor use.
