Pentax MX MX Manual - Page 34
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OPEN-APERTURE AND STOP-DOWN METERING LENSES Open-aperture SMC Pentax lenses have a diaphragm coupling lever 0 on the back of the lens which couples with the camera body to permit open-aperture metering. The ultra telephotos do not have a diaphragm coupler, so they must be used with the stop-down metering system. Use of the Auto-Extension Tube Set K permits open-aperture metering. USe of other K Series accessories - standard Extension Tube Set K, Helicoid Extension Tube K, Auto-Bellows M • and Bellows Unit III - requires stop-down metering. Whenever any one of these is used between the camera body and an SMC Pentax lens, the stop- st down metering system must be used. 320
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OPEN
-APERTURE
AND
STOP
-DOWN
METERING
LENSES
Open
-aperture
SMC
Pentax
lenses
have
a
diaphragm
coupling
lever
0
on
the
back
of
the
lens
which
couples
with
the
camera
body
to
permit
open
-aperture
metering.
The
ultra
telephotos
do
not
have
a
diaphragm
coupler,
so
they
must
be
used
with
the
stop
-down
metering
system.
Use
of
the
Auto
-Extension
Tube
Set
K
permits
open
-aperture
metering.
USe
of
other
K
Series
accessories
—
standard
Extension
Tube
Set
K,
Helicoid
Extension
Tube
K,
Auto
-Bellows
M
and
Bellows
Unit
III
—
requires
stop
-down
metering.
Whenever
any
one
of
these
is
used
between
the
camera
body
and
an
SMC
Pentax
lens,
the
stop
-
down
metering
system
must
be
used.
st
•
320