Nikon 25420 Flash Control, Shutter Speeds Available with the Built-in Flash, Supported Standards

Flash Control ( 99–101)

The following types of flash control are supported when a CPU lens is used in combination with the built-in flash or optional SB-400, SB-800, or SB-600 Speedlights.

•i-TTL Balanced Fill-Flash for Digital SLR: Flash output is adjusted for a natural balance between the main subject and the background.

•Standard i-TTLFill-Flash for Digital SLR: Flash output is adjusted for the main subject; the

brightness of the background is not taken into account. Recommended for use with exposure compensation, for shots in which the main subject is emphasized at the expense of background details, or when using an SC-series 17, 28, or 29 sync cable.

Standard i-TTL flash control is used with spot metering or when selected with the optional Speedlight. i-TTL balanced fill-flash for digital SLR is used in all other cases.

Shutter Speeds Available with the Built-in Flash

The following shutter speeds are available when the built-in flash is used.

Mode	Shutter speed
, , , P, A	1/500–1/60 s
	1/500–1/125 s

Mode	Shutter speed
	1/500–1s
S, M	1/500–30s

Aperture, Sensitivity, and Flash Range

Flash range varies with sensitivity (ISO equivalency) and aperture.

	Aperture at ISO equivalent of				Range
200	400	800	1600	m		ft.
2	2.8	4	5.6	1.0–7.5		3ft. 3in.–24ft. 7in.
2.8	4	5.6	8	0.7–5.4		2ft. 4in.–17ft. 9in.
4	5.6	8	11	0.6–3.8		2ft.–12ft. 6in.
5.6	8	11	16	0.6–2.7		2ft.–8ft. 10in.
8	11	16	22	0.6–1.9		2ft.–6ft. 3in.
11	16	22	32	0.6–1.4		2ft.–4ft. 7in.
16	22	32	—	0.6–0.9		2ft.–2ft. 11in.
22	32	—	—	0.6–0.7		2ft.–2ft. 4in.

Supported Standards

•DCF Version 2.0: The Design Rule for Camera File Systems (DCF) is a standard widely used in the digital camera industry to ensure compatibility among different makes of camera.

•DPOF: Digital Print Order Format (DPOF) is an industry-wide standard that allows pictures to be printed from print orders stored on the memory card.

•Exif version 2.21: The D40 supports Exif (Exchangeable Image File Format for Digital Still Cameras) version 2.21, a standard in which information stored with photographs is used for optimal color reproduction when the images are output on Exif-compliant printers.

•PictBridge: A standard developed through cooperation with the digital camera and printer industries, allowing photographs to be output directly to a printer without first transfer- ring them to a computer.

Technical Notes/Appendix 117