Slowsynchro or Nighttime flash mode

This automatic mode synchronizes your flash with the very slow shutter. It may have a "stars and mountain" or "stars and person" icon. The camera opens the shutter long enough to compensate for the dim twilight lighting, capturing all of the rich, saturated colors. The flash, meanwhile, throttles down, emitting just enough light to illuminate the subject from the front.

Figure 3-15. To capture a star trail image like this one of the Pleiades constellation (sometimes called the Seven Sisters), you need a shutter speed of just a few seconds. The longer the exposure, the longer the star trails, so push your camera to the limit. If the trails aren't bright enough, then increase your camera's light sensitivity by changing the film speed setting to

200 or 400.

Figure 3-16. Tired of having your flash subjects lost in a black hole of darkness? Try using what photographers call slowsynchro flash. The camera's flash ensures that the subjects are exposed properly.

Note: This mode also opens the aperture very wide to help expose the dim background, but you can't control precisely how wide. For more control, use aperture-priority mode, as described in the next section.

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