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Celestron FIRSTSCOPE 80 EQ - Page 12

Celestron FIRSTSCOPE 80 EQ
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There
are
numerous
optional
eyepieces
that
are
available
to
expand
your
range
of
magnification.
There
are
various
types
of
eyepieces
of
varying
quality
to
choose
from.
B.
Eyepieces
come
in
barrel
diameters
of
.96"
and
1-1/4".
In
general,
the
1-1/4"
eyepieces
are
of
a
higher
optical
quality
and
give
you
sharper
images
along
with
a
wider
field
of
view
and
better
eye
relief.
C.
Magnification
through
the
telescope
has
its
limits.
These
limits
are
determined
by
the
laws
of
optics
and
the
nature
of
the
human
eye.
The
maximum
usable
power
is
equal
to
60
times
the
aperture
of
the
telescope
(in
inches).
So
your
telescope
has
a
maximum
useful
power
of
188x
(3.14"
x
60).
You
can
create
power
higher
than
this
limit
but
the
images
will
be
dark
and
blurred.
The
maximum
power
is
used
only
under
ideal
conditions
which
are
not
common.
Most
of
your
viewing
will
be
done
in
the
range
of
35x
to
150x.
Higher
powers
are
used
mainly
for
lunar
and
planetary
observing.
D.
Your
telescope
comes
equipped
for
use
with
both
.96"
and
1-1/4"
eyepieces.
The
eyepiece
adapter
(#8)
is
set
up
for
usage
of
.96"
size
eyepieces.
The
inner
bushing
is
easily
removed
so
that
1-1/4"
eyepieces
can
be
used.
F.
When
changing
eyepieces,
you
will
have
to
refocus
by
turning
the
focusing
knob
(#9).
6.
TELESCOPE
OPERATION—ASTRONOMICAL
OBSERVING
After
you
have
read
and
followed
the
instruction
manual
to
this
point,
the
telescope
is
set
up
and
you
are
ready
to
begin
your
observing
adventure.
To
enable
you
to
find
objects
you
should
have
a
set
of
Star
Charts.
The
location
of
the
planets
may
appear
in
local
newspapers.
A,
The
Moon
is
an
awesome
first
object
to
observe.
The
best
observing
occurs
during
the
partial
phases
as
a
full
Moon
is
too
bright.
At
low
power
you
can
see
the
complete
Moon
and
at
high
powers
you
can
see
lunar
details
such
as
mountain
ranges,
craters
and
rills.
B.
Five
of
the
planets
are
easy
targets
for
your
telescope.
1.
See
Jupiter
with
its
great
red
spot,
study
the
cloud
bands
and
watch
its
moons
shuttle
back
and
forth.
2.
Study
Saturn
and
its
splendid
ring
structure.
3.
Observe
Mars
and
see
its
polar
cap.
12

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