Nikon SB-5000 AF Speedlight Reference Manual - English - Page 9
FX format/DX format, Guide number GN, EV Exposure Value, Front-curtain sync/rear-curtain sync
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Preparation ˙ FX format/DX format Nikon digital SLR camera image area types (FX format: 36 × 24, DX format: 24 × 16) ˙ Guide number (GN) The amount of light generated by a flash unit; as the number increases, A the light extends further. There is a relation represented by an equation, GN = flash-to-subject distance (m or ft) × aperture f-number (ISO 100). ˙ Step A unit of the shutter speed or aperture change; a change of 1 step halves/ doubles the amount of light entering the camera ˙ EV (Exposure Value) Each increment of 1 in exposure value corresponds to a 1-step change in exposure, which is made by halving/doubling shutter speed or aperture. An aperture of f/1.4 and a shutter speed of 1 second correspond to EV 1 which provides correct exposure or proper brightness of the subject. As the exposure value increases, the exposure of the film or imaging device increases. ˙ Front-curtain sync/rear-curtain sync In front-curtain sync, the flash fires immediately after the front curtain is fully open; the subject frozen by the flash appears behind the blurred movement. In rear-curtain sync, the flash fires moments before the rear curtain starts to close; the blur of a moving subject appears behind the subject and not in front, creating natural pictures. A-8