Nikon SB-27 - Manual (Page 85)

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Bounce flash operation
Bounce the light off the ceiling or walls to illuminate the subject
indirectly, softening shadows and producing more natural portraits.
The SB-27 comes with a built-in wide flash adapter for this purpose.
(Applicable to all camera groups)
Catchlight
By using the SB-27’s built-in diffuser and bouncing the light off the
ceiling, you can create a “catchlight” which softens harsh shadows
caused by bounced light, resulting in more natural portraits.
(Applicable to all camera groups)
Center-Weighted/Spot Fill-Flash
This mode operates with Center-Weighted or Spot metering. These
metering systems measure the background brightness and control
the flash, providing less light than with Matrix Balanced Fill-Flash.
Recommended with non-AF Nikkor lenses in place of Matrix
Balance Fill-Flash, which cannot be used.
(Applicable to F5, F4-Series, F100, F90X/N90s, F90-Series/N90,
F70-Series/N70, F60-Series/N60, F50-Series/N50, F-801s/N8008s,
F-801/N8008, F-601/N6006, F-601
M
/ N6000, F-401x/ N5005)
Flash exposure compensation
In combination with on-camera exposure compensation, you can
manually adjust the amount of flash output when using a Speedlight
in AUTO flash mode. To achieve correct exposure with a large
white background, a small subject in the center of the viewfinder, or
a subject close to the edge of the frame, underexpose; overexpose
if your subject is positioned against an “infinity” background.
(Applicable to all camera groups except group VII)
Flash shooting distance range
Your subject must be within acceptable flash shooting distance
range in order to receive sufficient illumination from the flash. This
range varies depending on the aperture and ISO film speed. In
flash operation, make sure that the subject is within flash shooting
distance range.
(Applicable to all camera groups)