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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 3200 6400 12800 m ft
1.4 2 2.8 4 5.6 8 11 16 1.0–8.5 3 ft 3in.–27 ft 11 in.
2 2.8 4 5.6 8 11 16 22 0.7–6.0 2ft 4in.–19ft 8in.
2.8 4 5.6 8 11 16 22 32 0.6–4.2 2 ft–13 ft 9 in.
4 5.6 8 11 16 22 32 — 0.6–3.0 2 ft–9 ft 10 in.
5.6 8 11 16 22 32 — — 0.6–2.1 2 ft–6 ft 11 in.
8 11 16 22 32 — — — 0.6–1.5 2 ft–4 ft 11 in.
11 16 22 32 — — — — 0.6–1.1 2ft–3 ft 7 in.
16 22 32 — — — — — 0.6–0.7 2ft–2 ft 4 in.