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A Aperture, Sensitivity, and Flash Range
Flash range varies with sensitivity (ISO equivalency) and aperture.
Aperture at ISO equivalent of Approximate range
100 200 400 800 1600 m ft.
1.4 2 2.8 4 5.6 1.0–8.5 3ft. 3in.–27ft. 11n.
2 2.8 4 5.6 8 0.7–6.0 2ft. 4in.–19ft. 8in.
2.8 4 5.6 8 11 0.6–4.2 2ft.–13ft. 9in.
4 5.6 8 11 16 0.6–3.0 2ft.–9ft. 10in.
5.6 8 11 16 22 0.6–2.1 2ft.–6ft. 11in.
8 11162232 0.6–1.5 2ft.–4ft. 11in.
11 16 22 32 — 0.6–1.1 2ft.–3ft. 7in.
16 22 32 — — 0.6–0.7 2ft.–2ft. 4in.