26
AUTOMATIC
DIAPHRAGM
AND
DEPTH-OF-FIELD
PREVIEW
LEVER
----------
The
fully automatic diaphragm
of
Miranda
lenses
is
of
special construction which keeps the
lens wide open all the time to provide a very
bright viewfinder image for easy picture com-
position and speedy adjustment
of
focus .
•
When
the
shutter
button
is
pressed, the
diaphragm automatically closes down to the
aperture to which the lens has been set
beforehand and makes it work only
at
that
aperture. But when the
shutter
closes, the
diaphragm automatically reopens .
•
The
viewing can therefore be done
at
fully
open aperture
at
all times. But
if
one desires
to actually check the effects
of
a given
aperture on the image, the special lever
on
the
lens barrel can be used.
This
preview
le
ve
r when depressed stops down the dia-
phragm temporarily to the aperture which
has been pre-selected
so
that
the
depth
of
field and background blurs can be directly
checked.
• Miranda's fully automatic diaphragm system
is
used
not
only in the standard
50mm
lens
but
also in all other Auto-Miranda lenses.
As
with
the standard lens, they permit
viewing
at
full aperture, no matter what
f-stop has been pre-set for the actual shoot-
ing.
In
snapshots particularly,
it
saves the
trouble
of
having to open the aperture for
focusing and to close it down for the shot.
•
When
changing the lens, it makes no dif-
ference whether the aperture
is
stopped
down or not, for once
it
is
mounted
on
the
camera the aperture automatically opens
fully.
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