Nikon D100 Product Manual - Page 112

Flash Photography Taking Photographs-Flash Photography Flash Range, Aperture, and Sensitivity Flash range varies with sensitivity (ISO equivalency) and aperture. Aperture at an ISO equivalent of Range 200 250 320 400 500 640 800 1000 1250 1600 m ft 2 2.2 2.5 2.8 3.2 3.5 4 4.5 5 5.6 2-8.5 6´7˝-27´11˝ 2.8 3.2 3.5 4 4.5 5 5.6 6.3 7.1 8 1.4-6 4´7˝-19´8˝ 4 4.5 5 5.6 6.3 7.1 8 9 10 11 1-4.2 3´3˝-13´9˝ 5.6 6.3 7.1 8 9 10 11 13 14 16 0.7-3 2´4˝-9´10˝ 8 9 10 11 13 14 16 18 20 22 0.6-2.1 2´-6´11˝ 11 13 14 16 18 20 22 25 29 32 0.6-1.5 2´-4´11˝ 16 18 20 22 25.4 29 32 - - - 0.6-1.1 2´-3´7˝ 22 25 29 32 0.6-0.8 2´-2´7˝ The minimum range at which the built-in Speedlight will be able to light the entire subject is 0.6 m (2´). In auto multi program, the maximum aperture (minimum f/-number) is limited according to sensitivity (ISO equivalency), as shown below: Maximum aperture at an ISO equivalent of 200 250 320 400 500 640 800 1000 1250 1600 3.3 3.5 3.8 4 4.2 4.5 4.8 5 5.3 5.6 For each one-step increase in sensitivity (e.g., from 200 to 400), aperture is stopped down by half an f/-stop. If the maximum aperture of the lens is smaller than given above, the maximum value for aperture will be the maximum aperture of the lens. D-TTL flash control can be used to adjust flash output at sensitivity (ISO equivalency) settings between 200 and 1600. At settings of HI-1 and HI-2, the desired results may not be achieved at some ranges or aperture settings. Using the Built-in Speedlight If the built-in Speedlight is raised in continuous shooting mode, only one photograph will be taken each time the shutter-release button is pressed. Vibration reduction (available with VR lenses) will not take effect if the shutter-release button is press halfway while the built-in Speedlight is charging. 100