Nikon Camera N90 - Manual (Page 178)

AUTOMATIC BALANCED FILL-FU\SH WITH
TTL MULTI SENSOR—3D MULTI-SENSOR
BALANCED FILL-FLASH AND MULTI­
SENSOR BALANCED FILL-FLASH
3D Multi-Sensor Balanced Fill-Flash is possible only with the
combination of the N90, a D-type AF Nikkor lens and the
Nikon SB-25 AF Speedlight. In this flash mode, just after you
depress the shutter release button and before the shutter is
activated, the SB-25 will fire a series of scarcely visible pre­
flashes (Monitor Pre-flashes) that are detected by the N90's
TTL Multi Sensor, then analyzed for brightness and contrast.
Additionally, Distance Information from the D-type AF Nikkor
lens in use, along with other exposure control information, is
integrated, thus automatically compensating flash output
level so that flash output and ambient light are balanced.
The Monitor Pre-flashes enable 3D Multi-Sensor Balanced
Fill-Flash to ensure correct exposure even in difficult
situations, including scenes with a very reflective object such
as a mirror or a white wall, and scenes with a very dark
backgrounds,
3D Multi-Sensor Fill-Flash is performed with all the
meters—Matrix, Center-Weighted and Spot.
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