1110
Chapter
1
Main Features/Functions — SB-25’s Flash Capabilities
Fully Automatic Fill Flash
Generally performed at night or in dim light, flash photogra-
phy can also be used to reduce shadows in pictures shot in
bright sunlight, resulting in a pleasing, more natural effect.
Using a flash this way, with ambient light, is called “fill-
flash.” When used with the SB-25, many Nikon SLR cam-
eras provide Automatic Balanced Fill-Flash, to automatically
keep flash brightness in balance with the ambient light.
The result is brighter shadows, sharper details and more
vivid colors. Matrix Balanced Fill-Flash operates in virtually
all light conditions within the camera’s metering range and
available synchronized shutter speeds. Operation is fast and
automatic, while it allows manual operation for exposure
compensation techniques to vary fill-flash effects.
Center-Weighted Fill-Flash operates when you switch
the metering system to Center-Weighted. This metering
system measures the entire scene and emphasizes its read-
ing on the center area. By pointing the center-weighted area
at different parts of the scene, you can choose which
brightness level you want for basic available-light exposure.
By selecting Spot Metering System, Spot Fill-Flash oper-
ates in a similar manner as Center-Weighted Fill-Flash,
although the meter reads a narrower center area, or “spot.”
Automatic Balanced Fill-Flash
Thanks to a computer-controlled exposure meter (multi-
segment sensor) and TTL (through-the-lens) sensor, shutter
speed, aperture, and even flash output can be automatically
controlled to keep both subject and background in correct
exposure.
In Matrix Balanced Fill-Flash, the camera’s Matrix
Metering System (i.e., multi-segment sensors) determines
the correct exposure based on ambient light. Flash output is
then controlled with the center-bottom-weighted TTL sen-
sor which monitors light reflection from the film surface and
regulates timing to terminate output in realtime with flash
illumination. This way, flash illumination brightens the scene
(mainly foreground subject), but does not overpower the
ambient light exposure (background).
Matrix Balanced Fill-Flash
The SB-25 is a most versatile Speedlight which offers vari-
ety of convenient features to enhance your flash photogra-
phy. To understand these features/function will help you
operate the SB-25 easily, therefore, enjoy more options and
creative possibilities. Each of following topics cover particu-
lar Nikon SLR models:
• Fully Automatic Fill Flash: F90-Series/N90, F4-Series,
F-801/N8008, F-801s/N8008s, F-601/N6006, F-601
M/
N6000 and F-401x/N5005
• Standard TTL Flash: F90-Series/N90, F4-Series,
F-801/N8008, F-801s/N8008s, F-601/N6006, F-601
M/
N6000, F-501/N2020, F-301/N2000, F-401/N4004,
F-401s/N4004s, FA, FE2, FG and Nikonos V
• FP High-Speed Sync Flash: F90-Series/N90
• Rear-Curtain Sync Flash: F90-Series/N90, F4-Series,
F-801/N8008, F-801s/N8008s, F-601/N6006 and
F-601
M/N6000
• Red-Eye Reduction Control: F90-Series/N90
• Repeating Flash: All the Nikon SLR models covered in
this manual
SB-25_En 03.1.14 8:18 PM Page 10
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