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Guide number tableGuide number table
The values for fi ring angle (ZOOM) indicate the focal length for a Four Thirds lens
(Unit: mm). The values inside the parentheses indicate the focal length for 135
fi lm (35 mm fi lm).
In the standard fl ash modes (standard light distribution; ISO100)
Flash
intensity
(RATIO)
Firing angle (ZOOM)
7 (14) 12 (24) 14 (28) 17 (35) 25 (50) 30 (60) 35 (70)
1/1 11.0 21.0 22.0 24.0 27.0 29.0 30.0
1/2 7.8 14.9 15.6 17.0 19.1 20.5 21.2
1/4 5.5 10.5 11.0 12.0 13.5 14.5 15.0
1/8 3.9 7.4 7.8 8.5 9.6 10.3 10.6
1/16 2.8 5.3 5.5 6.0 6.8 7.3 7.5
1/32 1.9 3.7 3.9 4.2 4.8 5.1 5.3
1/64 1.4 2.6 2.8 3.0 3.4 3.6 3.8
1/128 1.0 1.9 1.9 2.1 2.4 2.6 2.7
40 (80) 45 (90) 52 (105) 60 (120) 67 (135) 75 (150)
1/1 33.0 36.0 37.0 38.0 40.0 42.0
1/2 23.3 25.5 26.2 26.9 28.3 29.7
1/4 16.5 18.0 18.5 19.0 20.0 21.0
1/8 11.7 12.7 13.1 13.4 14.1 14.9
1/16 8.3 9.0 9.3 9.5 10.0 10.5
1/32 5.8 6.4 6.5 6.7 7.1 7.4
1/64 4.1 4.5 4.6 4.8 5.0 5.3
1/128 2.9 3.2 3.3 3.4 3.5 3.7