Nikon SB-27 - Manual (Page 63)

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When you wish to eliminate harsh shadows produced by a
single flash unit or if you want to extend light up into the
background, use more than one flash unit.
For multiple flash operation with the SB-27, both TTL Auto
and Manual (M) Flash modes are available.
—Multiple flash operation in TTL Auto Flash mode is possible with cameras
in Groups I thru VI and F3-Series cameras. Multiple flash operation in
Manual (M) Flash mode is possible with cameras in all groups.
—In multiple flash operation in either TTL or manual mode, first decide
which will be the main (Master) unit and which the secondary (Slave)
unit(s). For example, to eliminate shadows, adjust the lighting ratio so
that master unit illumination is greater than secondary unit illumination.
Flash shooting with one flash unit Flash shooting with more than one unit
Multiple flash operation—using more than one Speedlight
(Applicable to all camera groups)
NOTE
Cameras in Group I
With the SB-27 as the master flash set to 3D Multi-Sensor Balanced Fill-
Flash, you may not be able to obtain correct exposure because of a
change in lighting conditions between initial Monitor Preflash* and actual
flash firings. First cancel Monitor Preflash using one of the following
methods:
• Set the built-in wide flash adapter to the upper or left direction.
• Set the SB-27's flash operation to Standard TTL Flash (not Matrix
Balanced Fill-Flash.)
• Mount a Nikkor lens without built-in CPU.
• Set the camera's metering system to Spot (except F90X/N90s, F90-
Series/N90, F70-Series/N70 cameras).
*See page 86 on Monitor Preflash.