![]() ![]() (See below for more on that last item.) The D90's internal flash is fairly powerful, with a guide number of 12 meters or 39 feet at ISO 100 in auto mode, extending slightly to 13 meters (43 feet) in manual mode. ![]() Holding down the Flash Mode button while turning the Sub-command dial adjusts the overall brightness of the flash from -3 to +1 EV in one-third-step increments.īesides the main flash modes listed above, the D90's onboard speedlight can also be used in manual mode, as a repeating flash, or as a commander in Nikon's Creative Lighting System. Closing the flash disables it completely. In all flash modes, the flash fires with every exposure. Finally, Rear-Curtain Sync fires the flash at the end of the exposure, producing light trails that appear to follow (rather than precede) moving subjects. (This reduces the harsh effect of nighttime flash shots, allowing more of the ambient illumination into the picture.) Slow Sync mode works with shutter speeds as slow as 30 seconds to preserve color in night shots. Red-Eye Reduction with Slow Sync works in a similar fashion, but combines the flash with a slower shutter speed for night portraits. Red-Eye Reduction mode fires the (very bright) AF-assist light before the main flash exposure, to reduce the Red-Eye Effect in shots of people. Front-Curtain Sync fires the flash at the beginning of the exposure, with every shot. Like the D80 and D300, built into the D90 is an unusually capable pop-up flash unit, which operates in one of five main modes: Front-Curtain Sync, Red-Eye Reduction, Red-Eye Reduction with Slow Sync, Slow Sync, and Rear-Curtain Sync. ![]()
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