Nikon 4807 - SB 900 Speedlight, User Manual

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D – 6
D
Flash modes and functions
Auto aperture flash
The flash shooting distance range is indicated by
numbers and a bar chart in the LCD.
Set the shooting distance within this range.
The range varies depending on ISO sensitivity,
camera’s image area setting, illumination pattern,
angle of coverage and aperture. For more
information, see “Specifications.” (
k
F-16)
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Flash shooting distance range in Auto aperture flash mode
v
Notes on using a telephoto lens in the Auto aperture fl ash mode
When shooting a distant subject using a telephoto lens in “Auto
aperture flash” mode, underexposure may occur even though the
subject is within the flash shooting distance range.
Use of the i-TTL mode is recommended. •
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t
Monitor pre-fl ashes
Monitor pre-flashes on or off can be set by using the custom setting. (
k
C-22)
The SB-900 fires a series of imperceptible monitor pre-flashes immediately
before the flash fires to obtain information on the subject.
To perform the Auto FP-High Speed Sync (
k
D-55) or FV Lock (
k
D-55),
activate the monitor pre-flashes.
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