Nikon SB 30 Instruction Manual - Page 20
Manual flash mode
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Manual flash mode The SB-30's flash output level can be set manually at M1/1, M1/8, or M1/32. In the Manual mode, you must determine the correct exposure by calculation using a combination of the guide number, shooting distance, and lens aperture. • If the camera's exposure mode is set to other than Aperture-Priority Auto (A) or Manual (M), the shutter may not be released, depending on the cameras in use. Guide number (m/ft.) and ISO sensitivity ISO sensitivity Flash output level Flash output level (with wide-flash adapter in place) M1/1 M1/8 M1/32 M1/1 M1/8 M1/32 25 8/26 2.8/9 1.4/4.6 5/16 1.8/5.9 0.9/3 50 11/36 4/13 2/6.6 7.1/23 2.5/8.2 1.3/4.3 100 16/52 5.6/18 2.8/9.2 10/33 3.5/11 1.8/5.9 200 22/72 8/26 4/13 14/46 5/16 2.5/8.2 400 32/105 11/36 5.6/18 20/66 7.1/23 3.5/11 800 45/148 16/52 8/26 28/92 10/33 5/16 1600 64/210 22/72 11/36 40/131 14/46 7.1/23 • To obtain the correct exposure, use the following equations to determine the aperture and guide number to match the flash shooting distance. f/stop (aperture) = Guide number (GN) ÷ Shooting distance (m/ft) Guide number (GN) = Aperture x Shooting distance (m/ft) • For example, when shooting a subject at a distance of 2.5m (8.2 ft), at an ISO sensitivity of 400 and a lens aperture of f/2.8: Guide number = 2.8 x 2.5 = 7 (in meters) or 2.8 x 8.2 = approx. 23 (in feet). Therefore M1/8 is the correct flash output level with the wide-flash adapter in place. • Likewise, when shooting a subject at a distance of 4m (13 ft.), at an ISO sensitivity of 400 and M1/1 flash output level 18 without using the wide-flash adapter: f/stop = 32 ÷ 4 = 8 (in meters) or 105 ÷ 13 = approx. 8 (in feet). Therefore, f/8 is the correct lens aperture.
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