Nikon FSA02911 Instruction Manual - Page 51

% guide numbers (at ISO 100; for meters/feet) Shutter speed 24mm 28mm Zoom-head position 35mm 50mm 1/250 sec. 14/46 15/50 17/56 20/65 1/500 sec. 10/33 11/36 12/39 14/46 1/1000 sec. 7/23 7.5/25 8.5/28 10/33 1/2000 sec. 5/16 5.3/17 6/20 7/23 1/4000 sec. 3.5/11 3.7/12 4.2/14 5/16 70mm 23/74 16/52 11/36 8/26 5.7/18 85mm 24/77 17/56 12/39 8.5/28 6/20 % guide numbers vary with the ISO film speed, shutter speed, and zoomhead position. Adjustment factors for other ISO film speeds ISO film speed 25 50 200 400 800 Factor x 0.5 x 0.71 x 1.4 x 2 x 2.8 • For film speeds other than ISO 100, multiply the guide numbers by the factors shown in the above chart. For example, for a film speed of ISO 400, with the zoom-head adjusted to 35mm, and a shutter speed of 1/500 sec., the % guide number is 12 x 2 = 24 (m), or 39 x 2 = 78 (ft). Notes on flash photography in FP High-Speed Flash sync % • Do not use the built-in wide flash adapter. When used, M20 or M18, ƒ and % blink on the LCD panel as a warning. • Detaching the SB-28 When you remove the SB-28 from the F5, F100, F90X/N90s or F90Series/N90, be sure to cancel FP flash operation. If the flash is removed with the FP setting, % blinks as a warning. 51