Pentax ME-F ME-F Manual - Page 41

microscope

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Special Purpose Photography: The TTL electronic focus is also convenient for a wide range of special-purpose applications such as close-ups, macrophotography, photography with a microscope, or with shift or bellows lenses. In many of these instances, you can focus in the normal manner as described above. With bellows and lens extension accessories, however, the exposure factor will make the lens aperture smaller. Be sure to take this into account when you set the electro focus selector. Although most standard filters can be used with the lens, with dark black and white filters you should focus manually; also for regular polarizing filters. Battery Check: Battery voltage is adequate for correct focus with the TTL Electronic Focusing System as long as the LED focusing display inside the viewfinder lights. When the LEDs no longer light, voltage is insufficient for electronic focusing. If continued use of the electronic focus system is desired, replace all four batteries together. Do not mix battery brands or types; this could actually shorten battery life and is dangerous. NOTE: Battery voltage will be adequate for normal "Auto" or electronic manual exposures for a considerable time after voltage is no longer sufficient for electronic focusing. Exposure can be made in the normal manner without TTL electronic focus (See page 38). IMPORTANT: Always set the electro-focus selector to OFF when the electronic focusing system is not in use to ensure longer battery life. 37 •

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Special
Purpose
Photography:
The
TTL
electronic
focus
is
also
convenient
for
a
wide
range
of
special-purpose
applications
such
as
close-ups,
macrophotography,
photography
with
a
microscope,
or
with
shift
or
bellows
lenses.
In
many
of
these
instances,
you
can
focus
in
the
normal
manner
as
described
above.
With
bellows
and
lens
extension
accessories,
however,
the
exposure
factor
will
make
the
lens
aperture
smaller.
Be
sure
to
take
this
into
account
when
you
set
the
electro
focus
selector.
Although
most
standard
filters
can
be
used
with
the
lens,
with
dark
black
and
white
filters
you
should
focus
manually;
also
for
regular
polarizing
filters.
Battery
Check:
Battery
voltage
is
adequate
for
correct
focus
with
the
TTL
Electronic
Focusing
System
as
long
as
the
LED
focusing
display
inside
the
viewfinder
lights.
When
the
LEDs
no
longer
light,
voltage
is
insufficient
for
electronic
focusing.
If
continued
use
of
the
electronic
focus
system
is
desired,
replace
all
four
batteries
together.
Do
not
mix
battery
brands
or
types;
this
could
actually
shorten
battery
life
and
is
dangerous.
NOTE:
Battery
voltage
will
be
adequate
for
normal
"Auto"
or
electronic
manual
exposures
for
a
considerable
time
after
voltage
is
no
longer
sufficient
for
electronic
focusing.
Exposure
can
be
made
in
the
normal
manner
without
TTL
electronic
focus
(See
page
38).
IMPORTANT:
Always
set
the
electro-focus
selector
to
OFF
when
the
electron-
ic
focusing
system
is
not
in
use
to
ensure
longer
battery
life.
37
•