.
Figure
2 -
The
view looking down the focuser
of
a collimated Newtonian reflector
with
the eyepiece removed.
three· collimation screws located on the top
of
the
secondary mirror holder to center the reflection
of
the
primary mirror underneath the cross hairs
of
the
Collimation Eyepiece.
6.
Now that you can see the entire primary mirror
reflected
in
the secondary mirror, you my notice that
the reflection'
of
the secondary mirror
is
not perfectly
centered
in
the primary mirror (see figure 4). To
correct this, you must adjust the primary mirror
collimation screws located on the bottom
of
the
primary mirror celL
Tum
the collimation screws,
one at a time,
reflected
in
the
secondary
mirror
is
positioned
in
the center
of
the primary
mirror. For
added ease and
accuracy, a
small black dot
can be placed
in
the center
of
the primary
mirror and he
used to align
the primary ..
Simply adjust
the mirror until
the dot on the
primary is
centered
in
the
middle
of
the
bright ring.
Cross hairs
of
Collimation
until the center
of
the bright ring
Secondary
Mirror
(actual)
Spider
vanes (or
stalk) reflected in
primary
Secondary
Mirror
(reflected)
Mirror
Dot (optional)
Prima
Secocdary
Holder
Primary
Mirror
Clips
If
the view seen through the focuser tube resembles that
of
figure 2, then your telescope
is
properly collimated and
ready for observing. However,
if
the collimation
is
noticeably off, repeat steps 5 and 6 until aligned.
Collimating a Schmidt-Cassegrain Telescope
Insert the Collimation Eyepiece directly into the visual back
of
the telescope. The shadow
of
the secondary will appear
as a dark circle near the middle
of
the field
of
view. Make
adjustments to the three collimation 3crews
in
the center
of
the corrector plate
to center the
secondary mirror on
the cross hairs.
This
is
the only
collimation
adjustment possible
for this type
of
telescope,
It
should
~ke
only a fragion
of
a tum to make a
noticeable change
ill
collimation,
N ever loosen the
screw
in
the center
of
the secondary
housing;
it
may
result
in the mirror
coming o
ff
its
mount.
Figure
3 -
Make
adjustments
to the
secondary
mirror
until you
can
see
the
entire
primary
mirror
reflected
in
the
secondary
mirror
as in figure 4.
:;;
I
Figure
4 -
Make
adjustments
to the
primary
mirror
to
center
the reflection
of
the
secondary
mirror
inside
--
---
-
Che
primary
mirror.
Warranty: One year limited warranty. See the Celestron Accessory Catalog (#93685) for complete warranty details or contact Celestron
#94182
(0100).
Celestron International, 2835 Columbia Street, Torrance,
CA
90503·
Phone (310) 328·9560 •
Fax
(310) 212·5835
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