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114
Compatible Speedlights (continued)
ADVANCED PHOTOGRAPHY—COMPATIBLE SPEEDLIGHTS
Refer to your Speedlight manual for detailed instructions. In the table of different camera types
given in the SB-28DX manual, your Nikon digital camera is classified as type A.
The shutter will synchronize with the flash when set to speeds of
1
/
500
sec. or slower. When
using the Medical Nikkor 120 mm f/4 lens, set the shutter speed to
1
/
125
sec. or slower.
If the flash-ready indicator blinks for about three seconds after a photograph is taken with the
SB-28DX or SB-50DX set to D-TTL, the photograph may be underexposed. Check the pho-
tograph in the monitor. If it is underexposed, adjust the focus distance, aperture, or flash range
and tr y again.
The underexposure warning may not be displayed when Speedlights other than the SB-28DX
or SB-50DX are used with a shutter speed of
1
/
500
s. Should you find that images are underex-
posed even when no warning has appeared in the viewfinder, set the shutter speed to
1
/
250
s
and tr y again.
EV steps for exposure control are set to
1
/
3
increments on the Speedlight exposure display.
Therefore when the display on the camera body is set to
1
/
2
increments (using Custom Setting
20), the Speedlight exposure display will not show the correct ISO value. This does not affect
the actual exposure value which will be set as displayed on the camera body.
Sensitivity settings available for D-TTL flash photography are ISO 125, 160, 200, 250, 320, 400,
500, 640, and 800 equivalent. If Sensitivity Boost (Custom Setting 31) is used, the flash may not
produce appropriate lighting, depending on the aperture or distance to the subject.
In the case of Speedlights equipped with an AF-Assist Illuminator, the illuminator will only light
when the center focus area is used.
When the exposure mode is set to programmed auto, the maximum aperture varies with
sensitivity, as shown below:
Sensitivity (ISO equivalent)
Maximum aperture
For each increase in sensitivity, aper ture is stopped down by half a step. If the lens has a smaller
maximum aperture than that given above, the maximum aperture will be the maximum aper-
ture for the lens.
125
4.2
160
4.5
200
4.8
250
5
320
5.3
400
5.6
Sensitivity (ISO equivalent)
Maximum aperture
500
6
640
6.3
800
6.7
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