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FP Flash
High-Speed Sync Guide Number Table
Shutter Speed
Guide Number (m/ft)
ISO 100
ISO 200
ISO 400
1/125
13 3/43,6
18 8/61 7
26.6/87,2
1/180
12/39 4
17/55.8
24/78 7
1/250
10 7/35.1
15 1/49.5
21.4/70 2
1/350
9 1/30
12.9/42.3
18.2/59.7
1/500
7.7/25.3
10.9/35.8
15.4/50.5
1/750
6.5/21 3
9.2/30.2
13/42.6
1/1000
5.4/177
76/249
10.8/35 4
1/1500
4.6/15.1
6 5/21 3
9.2/30.2
1/2000
3 8/12.5
5.4/17.7
7.6/24.9
f/3000
3.2/10.5
4.5/14.8
6 4/21
1/4000
2 7/8 9
4/13 1
5 4/17.7
The Speedlite 220EX Guide Number changes
according to the high-speed sync operations. The
flash range decreases as the shutter speed
increases with FP flash.
The limit of the flash range can be calculated with
the following formula: Guide Number -t- the dis¬
tance calculated from the aperture setting
22
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