Nikon SB 27 Instruction Manual - Page 84

Automatic Balanced Fill-Flash with TTL Multi Sensor 3D multi

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Page 84 highlights

Glossary of terms 1/300 TTL High-Speed Sync Flash The F5's sync shutter speed can be set to 1/300 sec. using a custom function setting. This is available with the SB-27 set to AUTO (TTL) and the camera's exposure mode set to S or M. In this case the SB-27's guide number is approx. 14 (at the 35mm zoom-head position, ISO 100: for m). In P or A mode, 1/300 TTL High-Speed Sync Flash does not work and shutter speed is automatically set to 1/250 sec. (Applicable to F5) 3D Multi-Sensor Balanced Fill-Flash This mode automatically controls flash output so as to keep both subject and background perfectly exposed. The SB-27 fires a series of nearly invisible preflashes or Monitor Preflash. These preflashes are detected by the TTL multi-sensor (5segment sensor) in Group I cameras and the data is then integrated with distance information from D-type Nikkor lenses and other exposure data to determine the optimal flash shooting distance range and light output level for balanced fill-flash exposure. This is especially effective with scenes that include: (1) a mirror, white wall or other highly reflective surface, (2) unwanted obstacle(s) in front of the subject. (Applicable to F5, F100, F90X/N90s, F90-Series/N90, F80-Series/N80-Series, F70-Series/N70) Autofocus assist illumination Allows you to autofocus in dim light or in the dark with Nikon AF cameras. When you press the shutter release button halfway, the AF illuminator automatically turns ON to give contrast to a dark subject, thus enabling the camera's autofocus system to function. (Applicable to all Nikon AF cameras) Automatic Balanced Fill-Flash with TTL Multi Sensor (3D multisensor balanced fill-flash and multi-sensor balanced fill-flash) With D-type AF Nikkor lenses, 3D multi-sensor balanced fill-flash is performed, whereby the SB-27 fires a series of weak preflashes (Monitor Preflash) that are detected by the camera's TTL Multi Sensor, then analyzed for brightness and contrast along with Distance Information from the D-type AF Nikkor lens. The flash output level is automatically compensated so that both flash output and ambient light are perfectly balanced. With non-D-type AF Nikkor lenses, Multi-Sensor balanced Fill-Flash, which offers the same output control system minus Distance Information, is performed. These flash modes are effective in scenes with highly reflective objects such as a mirror or a white wall, and scenes with very dark backgrounds. (Applicable to F5, F100, F90X/N90s, F90-Series/N90, F80-Series/N80-Series, F70-Series/N70) 

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Glossary of terms
84
1/300 TTL High-Speed Sync Flash
The F5’s sync shutter speed can be set to 1/300 sec. using a custom function
setting. This is available with the SB-27 set to AUTO (TTL) and the camera’s
exposure mode set to S or M. In this case the SB-27’s guide number is approx.
14 (at the 35mm zoom-head position, ISO 100: for m).
In P or A mode, 1/300 TTL High-Speed Sync Flash does not work and shutter
speed is automatically set to 1/250 sec.
(Applicable to F5)
3D Multi-Sensor Balanced Fill-Flash
This mode automatically controls flash output so as to keep both subject and
background perfectly exposed.
The SB-27 fires a series of nearly invisible preflashes or
Monitor Preflash. These preflashes are detected by the TTL multi-sensor (5-
segment sensor) in Group I cameras and the data is then integrated with
distance information from D-type Nikkor lenses and other exposure data to
determine the optimal flash shooting distance range and light output level for
balanced fill-flash exposure. This is especially effective with scenes that
include: (1) a mirror, white wall or other highly reflective surface, (2) unwanted
obstacle(s) in front of the subject.
(Applicable to F5, F100, F90X/N90s, F90-Series/N90, F80-Series/N80-Series,
F70-Series/N70)
Autofocus assist illumination
Allows you to autofocus in dim light or in the dark with Nikon AF cameras.
When you press the shutter release button halfway, the AF illuminator
automatically turns ON to give contrast to a dark subject, thus enabling the
camera’s autofocus system to function.
(Applicable to all Nikon AF cameras)
Automatic Balanced Fill-Flash with TTL Multi Sensor (3D multi-
sensor balanced fill-flash and multi-sensor balanced fill-flash)
With D-type AF Nikkor lenses, 3D multi-sensor balanced fill-flash is performed,
whereby the SB-27 fires a series of weak preflashes (Monitor Preflash) that are
detected by the camera’s TTL Multi Sensor, then analyzed for brightness and
contrast along with Distance Information from the D-type AF Nikkor lens. The
flash output level is automatically compensated so that both flash output and
ambient light are perfectly balanced.
With non-D-type AF Nikkor lenses, Multi-Sensor balanced Fill-Flash, which offers
the same output control system minus Distance Information, is performed.
These flash modes are effective in scenes with highly reflective objects such
as a mirror or a white wall, and scenes with very dark backgrounds.
(Applicable to F5, F100, F90X/N90s, F90-Series/N90, F80-Series/N80-Series,
F70-Series/N70)