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TTL Auto Flash Mode: For F-501/N2020 and F-301/N2000 Users
Chapter
3
Choosing A Flash Method
The SB-25 lets you choose between Programmed TTL Auto
Flash or Standard TTL Flash in TTL Auto flash mode.
Use the charts at right to confirm available flash/exposure
mode combinations.
Programmed TTL Auto Flash
By setting the cameras exposure mode to a programmed
auto setting (either PDUAL
, P or PHI), you can choose
Programmed TTL Auto Flash.
In Programmed TTL Auto Flash, the camera automatically
selects a shutter speed of 1/125 sec. and a controlled aper-
ture that corresponds to the ISO speed of the film in use
(see chart on page 68).
Flash output is regulated by the Speedlight to ensure a
correct subject exposure. This enables you to concentrate
on picture composition without worrying about exposure
settings (including aperture).
You can also perform Standard TTL Flash with the cam-
era set at aperture-priority auto (A) or manual exposure
mode. In Standard TTL Flash, the Speedlight controls the
flash output level to correctly expose the subject. Shutter-
speed and/or aperture setting(s) can be selected by the
user.
Set Up and Practice
You can choose Programmed TTL Auto Flash against
Standard TTL Flash by setting camera to a programmed
auto exposure mode (either PDUAL
, P or PHI). Check charts
on the previous page.
Before proceeding:
ATTACH SPEEDLIGHT TO CAMERA.
TURN ON BOTH SPEEDLIGHT AND CAMERA.
USE SINGLE-SERVO AUTOFOCUS (S) OR MANUAL
FOCUS (M).
USE SINGLE-FRAME SHOOTING (S) FILM ADVANCE
MODE.
USE FILM WITH A SPEED BETWEEN ISO 25 AND ISO
1000.
USE AN AI-S LENS (AF Nikkor, Nikkor lens with built-in
CPU or Series E lens).
To distinguish AI-S lenses from others
Look for an orange mark on the minimum aperture
scale of the lens.
Setting Up SB-25
1) Suitable lenses and use depend on the camera; see instruction manual for
information.
2) Except AF lenses for F3AF cameras.
For Programmed TTL Auto Flash, use only AI-S lenses, which include AF
Nikkor, Nikkor lenses with a built-in CPU and Series E lenses.
TTL Auto flash mode with F-501/N2020 and
F-301/N2000
Lens in Use
1)
AI-S type
lenses
(including
AF Nikkor
and AI-P)
2)
Camera’s
Exposure Mode
Programmed auto
(P
DUAL, P or PHI)
Aperture-priority
auto (A)
Manual (M)
SB-25 Flash
Programmed TTL Auto Flash
Standard TTL Flash
1 Flash mode selector
at TTL Auto
2 Flash sync mode
selector at NORMAL
3 ISO speed
of film in
use
4 Zoom-head position
7 Aperture
value
SB-25_En 03.1.14 8:18 PM Page 64
33


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