179AppendixTechnical NotesFlash ControlFlash output is adjusted using one of the following systems when a CPU lens is used incombination with the built-in flash or optional SB-400, SB-800, or SB-600 Speedlights.Standard i-TTL flash control is used with spot metering (A 62) or when selected with theoptional Speedlight. i-TTL balanced fill-flash for digital SLR is used in all other cases.Shutter Speeds Available with the Built-in FlashAperture, Sensitivity, and Flash RangeFlash range varies with sensitivity (ISO equivalency) and aperture.i-TTL Balanced Fill-Flash for Digital SLRFlash output is adjusted for a natural balance between the main subject and thebackground.Standard i-TTL Fill-Flash for Digital SLRFlash output is adjusted for the main subject; the brightness of the background is not takeninto account. Recommended for use with exposure compensation, for shots in which themain subject is emphasized at the expense of background details.Mode Shutter speed Mode Shutter speede, g, i, a, c 1/ 200 –1 /60 s b 1 /200 –30sk 1 /200 –1/ 125 s d 1 /200 –30s, Bulbl 1/ 200 –1sISO equivalent Range (m/ft.)100 200 400 800 1600Aperture1.4 2 2.8 4 5.6 1.0–8.5 (3ft. 3in.–27ft. 11in.)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 11 16 22 32 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.)
