Nikon F55 - F55 35mm SLR Camera Instruction Manual page 48

Usable Optional Speedlights
5 Confirm appears in the viewfinder, focus and fully depress
the shutter release button to shoot.
• in the viewfinder blinks approx. 3 sec. after full flash output. This may indicate
underexposure has occurred. Check the focus distance, aperture or flash shooting
distance range and shoot again.
• When the subject is dark, the camera's AF-Assist Illuminator automatically turns
on to guide autofocus (the Speedlight's AF-Assist Illuminator does not turn on).
See page 50 for details.
Non-TTL Auto Flash
In Non-TTL Auto Flash shooting, light output automatically changes to match the
flash-to-subject distance, but the light is measured by the light sensor on the optional
Speedlight instead of being measured through the lens. Compared to TTL Auto Flash
of the built-in Speedlight, where the light is measured through the lens, the control of
the flash output level is somewhat less accurate.
94
—continued
Programmed Flash mode
When the optional Speedlight is attached with the flash mode set to A (Non-
TTL Auto Flash) and the exposure mode dial is set to
S, Programmed Flash is performed (camera aperture is automatically
controlled according to the film speed).
• When an optional Speedlight is attached and the camera power switch is turned on,
the camera automatically selects the aperture according to the film speed. Set the
aperture on the Speedlight according to the aperture indicated on the camera.
ISO film speed
Aperture
* One EV change in the film speed changes aperture by one EV. If the film speed of the
film in use is an intermediate value of the film speed indicated in the table, the
aperture changes accordingly. If the controlled aperture is darker than maximum
aperture, maximum aperture of the attached lens is selected.
• See "Non-TTL Auto Flash using optional Speedlight" on page 92 for the operation
other than setting the aperture.
Available flash sync mode with optional Speedlight
Exposure
mode
P
S
A
M
* Built-in Speedlight is always set to Flash Cancel when
shooting becomes possible with optional Speedlight. However, turning the optional
Speedlight power off activates Flash Cancel mode.
25 50
2 2.8
Front-Curtain Red-Eye
Reduction with
Sync Reduction
*
*
, Vari-Program, P or
100 200 400 800
4 5.6 8 11
Red-Eye
Slow Sync Flash Cancel
Slow Sync
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or is selected but flash
95