Pentax SF-1 SF-1 Manual - Page 46

indication, appears, focusing, impossible., s, AF400FTZ's, spotbeam, projector, built, camera,

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• If the lens aperture ring is set at any f-number for the selected exposure mode, the effective flash range is determined by the selected aperture (G.N. 14 f/4 = 3.5m), and the flash-sync shutter speed is set at 1/100 sec. • When a lens with a maximum aperture of f/2.8 or smaller is used, the aperture display in the CENTIC panel starts from that maximum aperture of the lens. • The Program Flash system can be used in combination with a Pentax-F or -A lens. Be aware that the RTF's discharge may be cut off by wide-angle lenses or lenses with a large diameter. • When a Pentax-F lens that may cut off the RTF's discharge is mounted (e.g., some zoom, telephoto and macro lenses), the red flash-ready indicator [ S ] blinks to warn the photographer. In this case, the shutter can be released but the RTF will not discharge. • Do not use a lens hood. The RTF's discharge is also cut off within the distance of lm when a 35mm wide angle is mounted, so do not use the RTF in such cases. • Be aware that photographing a person straight on from the front using a flash beyond a distance of 3m may cause the "red-eye" phenomenon produced when light reflects off the retinas. (This can be avoided by directing the subject's gaze away from the camera.) AF Spotbeam Projector When using the RTF in a dark location, the AF spotbeam projector automatically emits an infrared beam to assist the auto-focus system. The spotbeam projector can also be used in dim locations where the auto-focus system may not work effectively. • The AF spotbeam projector can be used only when the focus-mode switch is set at the SINGLE position. It will not work at any other position. • The AF spotbeam projector's effective range is approximately 1m to 4m. If flash illumination is unnecessary, push down the RTF unit after the AF system captures the subject in focus. • The AF spotbeam projector does not operate for bright subjects. • If the [►1] indication appears, auto-focusing is impossible. (See pages 33 to 35.) • When the AF400FTZ's AF spotbeam projector is used, the AF spotbeam projector built into the camera does not operate. • 42

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•
If
the
lens
aperture
ring
is
set
at
any
f-number
for
the
selected
exposure
mode,
the
effective
flash
range
is
determined
by
the
selected
aperture
(G.N.
14
f/4
=
3.5m),
and
the
flash
-sync
shutter
speed
is
set
at
1/100
sec.
•
When
a
lens
with
a
maximum
aperture
of
f/2.8
or
smaller
is
used,
the
aperture
display
in
the
CENTIC
panel
starts
from
that
maximum
aperture
of
the
lens.
•
The
Program
Flash
system
can
be
used
in
combination
with
a
Pentax-F
or
-A
lens.
Be
aware
that
the
RTF's
discharge
may
be
cut
off
by
wide-angle
lenses
or
lenses
with
a
large
diameter.
•
When
a
Pentax-F
lens
that
may
cut
off
the
RTF's
discharge
is
mounted
(e.g.,
some
zoom,
telephoto
and
macro
lenses),
the
red
flash
-ready
indicator
[
S
]
blinks
to
warn
the
photographer.
In
this
case,
the
shutter
can
be
released
but
the
RTF
will
not
discharge.
•
Do
not
use
a
lens
hood.
The
RTF's
discharge
is
also
cut
off
within
the
distance
of
lm
when
a
35mm
wide
angle
is
mounted,
so
do
not
use
the
RTF
in
such
cases.
•
Be
aware
that
photographing
a
person
straight
on
from
the
front
using
a
flash
beyond
a
distance
of
3m
may
cause
the
"red
-eye"
phenomenon
produced
when
light
reflects
off
the
retinas.
(This
can
be
avoided
by
directing
the
subject's
gaze
away
from
the
camera.)
AF
Spotbeam
Projector
When
using
the
RTF
in
a
dark
location,
the
AF
spotbeam
projector
automatically
emits
an
infrared
beam
to
assist
the
auto
-focus
system.
The
spotbeam
projector
can
also
be
used
in
dim
locations
where
the
auto
-focus
system
may
not
work
effectively.
•
The
AF
spotbeam
projector
can
be
used
only
when
the
focus
-mode
switch
is
set
at
the
SINGLE
position.
It
will
not
work
at
any
other
position.
•
The
AF
spotbeam
projector's
effective
range
is
approximately
1m
to
4m.
If
flash
illumination
is
unneces-
sary,
push
down
the
RTF
unit
after
the
AF
system
captures
the
subject
in
focus.
•
The
AF
spotbeam
projector
does
not
operate
for
bright
subjects.
•
If
the
[►1]
indication
appears,
auto
-focusing
is
impossible.
(See
pages
33
to
35.)
•
When
the
AF400FTZ's
AF
spotbeam
projector
is
used,
the
AF
spotbeam
projector
built
into
the
camera
does
not
operate.
•
42