Meike Speedlite MK430 - Page 28

Guide number of different focal length range(at ISO 100, in meters / feet)
-27-
430 GN: ISO 100 (meters / feet)
42
1/1
1/2
1/4
1/8
1/16
1/32
1/64
1/128
18 20 24 28 35 50 70 85 105 120 135 180
17.8/
59.6
18.6/
62.2
20.9/
69.9
23.3/
77.7
26.4/
88.1
31.1/
103.7
34.2/
114
36.5/
121.8
38.4/
128.3
39.6/
132.2
40/
133.5
42/
139.9
12.5/
41.9
13.1/
43.8
14.7/
49.2
16.4/
54.9
18.6/
62.2
21.9/
73.1
24.1/
80.6
25.8/
86
27.2/
90.7
27.9/
93.3
28.3/
94.3
29.6/
98.7
8.9/
29.8
9.3/
31.1
10.4/
34.9
11.6/
38.8
13.2/
44
15.5/
51.8
17.1/
57
18.2/
60.9
19.2/
64
19.8/
66.1
19.9/
66.6
20.9/
69.9
6.2/
20.9
6.5/
21.7
7.3/
24.6
8.2/
27.4
9.3/
31.1
10.9/
36.5
12/
40.1
12.9/
43
13.6/
45.3
13.9/
46.6
14.1/
47.1
14.7/
49.2
4.4/
14.7
4.6/
15.5
5.2/
17.3
5.8/
19.4
6.6/
22
7.7/
25.9
8.5/
28.5
9/
30.3
9.7/
32.6
9.8/
32.6
9.9/
33.1
10.4/
34.9
3.1/
10.3
3.2/
10.8
3.6/
12.1
4.1/
13.7
4.6/
15.5
5.4/
18.1
5.9/
19.9
6.7/
22.5
6.9/
23.3
7/
23.5
7.3/
24.6
6.4/
21.5
2.1/
7.2
2.3/
7.7
2.5/
8.5
2.8/
9.5
3.2/
10.8
3.8/
12.9
4.2/
14.2
4.5/
15
4.7/
15.8
4.8/
16.3
4.9/
16.5
5.2/
17.3
1.5/
5.1
1.6/
5.4
1.7/
5.9
2/
6.7
2.3/
7.7
2.7/
9
2.9/
9.8
3.1/
10.6
3.3/
11.1
3.4/
11.6
3.4/
11.6
3.6/
12.1
Coverage(MM)
Flash
output
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