Pentax ES ES Manual - Page 15

Compose, Focus

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COMPOSE AND FOCUS While viewing through the viewfinder, turn the focusing ring until your subject image comes into sharp focus. Pentax cameras have a Fresnel lens with a microprism center underneath the ground glass. As you look through the finder, you will see that the Fresnel lens consists of many concentric rings which provide the brightest possible image on the ground glass. The microprism is the center portion of this diagram. When your subject is in focus, the image in the microprism will be sharp and perfectly clear. If your subject is not in focus, the microprism will break the image into many small dots, much like an engraver's screen. You can focus your subject on any portion of the ground glass. 13

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COMPOSE
AND
FOCUS
While
viewing
through
the
viewfinder,
turn
the
focusing
ring
until
your
subject
image
comes
into
sharp
focus.
Pentax
cameras
have
a
Fresnel
lens
with
a
micro
-
prism
center
underneath
the
ground
glass.
As
you
look
through
the
finder,
you
will
see
that
the
Fresnel
lens
consists
of
many
concentric
rings
which
provide
the
brightest
possible
image
on
the
ground
glass.
The
microprism
is
the
center
portion
of
this
dia-
gram.
When
your
subject
is
in
focus,
the
image
in
the
microprism
will
be
sharp
and
perfectly
clear.
If
your
subject
is
not
in
focus,
the
micro
-
prism
will
break
the
image
into
many
small
dots,
much
like
an
engraver's
screen.
You
can
focus
your
subject
on
any
portion
of
the
ground
glass.
13