Nikon D5100 User Manual page 159

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Flash Modes
The flash modes listed on the previous page may combine one or more of the following
settings, as shown by the flash mode icon:
• AUTO (auto flash): When lighting is poor or subject is back lit, flash pops up automatically
when shutter-release button is pressed halfway and fires as required.
• j (red-eye reduction): Use for portraits. Red-eye reduction lamp lights before flash fires,
reducing "red-eye. "
• j (off): Flash does not fire even when lighting is poor or subject is back-lit.
• SLOW (slow sync): Shutter speed slows automatically to capture background lighting at night
or under low light. Use to include background lighting in portraits.
• REAR (rear-curtain sync): Flash fires just before shutter closes, creating a stream of light behind
moving light sources (below at right). If this icon is not displayed, flash will fire as the
shutter opens (front-curtain sync; the effect this produces with moving light sources is
shown below at left).
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Choosing a Flash Mode
The flash mode can also be
selected by pressing the M
button and rotating the
command dial (in P, S, A, M, and 0
modes, raise the flash before
using the M button to choose the
flash mode).
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The Built-in Flash
For information on the lenses that can be used with the built-in flash, see page 200. Remove
lens hoods to prevent shadows. The flash has a minimum range of 0.6 m (2 ft.) and can not
be used in the macro range of zoom lenses with a macro function.
The shutter release may be briefly disabled to protect the flash after it has been used for
several consecutive shots. The flash can be used again after a short pause.
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Front-curtain sync
M button
Rear-curtain sync
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Command dial Information display