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Celestron C4.5 - Aligning the Primary Mirror

Celestron C4.5
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48
Telescope
Maintenance
Aligning
the
Primary
Mirror
To
adjust
the
primary
mirror:
1.
Locate
the
adjustment
screws
at
the
end
of
the
tube
where
the
primary
mirror
sits.
2.
Tighten
and
loosen
the
adjustment
screws
as
needed
to
center
the
reflection
of
the
secondary
mirror
in
the
primary
mirror.
This
is
a
trial
and
error
process!
The
screws
on
the
back
of
the
primary
mirror
are
paired.
Within
each
pair
one
screw
pushes
on
the
primary
mirror
while
the
other
one
pulls.
If
you
loosen
a
screw
you
must
tighten
its
partner.
The
primary
mirror
is
now
properly
aligned.
The
telescope
is
in
correct
collimation
and
will
produce
the
best
possible
images.
Secondary
Mirror
Reflection
(with
reflection
of
eye)
Figure
8-3
This
illustration
on
the
left
shows
the
image
seen
through
the
telescope
when
properly
collimated.
As
mentioned
in
the
text,
most
collimation
adjustments
are
made
to
the
primary
mirror.
The
illustration
on
the
right
shows
the
adjustment
screws
on
the
rear
cell
of
the
telescope.

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