Definition of Iris diaphragm
I´ris di´a`phragm
1.
An
adjustable
diaphragm
,
reminiscent
of
the
iris
of
the
eye
in
its
action
,
by
which
the
diameter
of
an
approximately
circular
opening
may
be
controlled
,
as
for
regulating
the
aperture
of
a
lens
;
it
consists
of
a
number
of
movable
thin
curved
plates
fastened
at
regular
intervals
around
the
inside
of
a
ring
,
the
positions
of
which
are
simultaneously
adjusted
by
a
single
knob
on
the
outside
of
the
lens
.
It
is
used
in
cameras
and
microscopes
.
Related Words
diaphragm
,
iris
,
stop
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