Celestron 94182 Panduan Memulai Cepat
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Halaman Cetak
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41
"
Collimation Eyepiece- Model #94182
Collimation is the process of aligning the optical
Using the Collimation Eyepiece
axes of all the optical elements in a
telescope.
When
properly collimated, all the mirrors (or lens) will be
1. Remove the eyepiece or any other accessory from
centered and angled so that the light entering the
the focuser and rack the focuser all the way in
telescope will form the sharpe
pessible-irnag
h
towards the tube.
Collimation
Eyepiece
is a
combination of a "sight tube"
and a
·
"Cheshire eyepiece."
The sight tube portion of the
Collimation
eyepiece
has
cross hairs to accurately define
the center of the optical
axis,
and is used to make sure that
the
secondary
mirror
is
centered directly under the
focuser. The Cheshire portion
of the eyepiece has a polished
45°
angled
element
that
reflects light from the cutout
hole in the side of the barrel
down
into
the
optical
path.
The
polished
flat
element
projects a bright ring of light,
providing a target for aligning
the primary mirror.
Identifying What You See.
Figure 2 represents what
-
a
properly
collimated
Newtonian telescope would
look like when looking into the
focuser tube with the eyepiece
Sight Hole
Polished 45°
Reflective Flat
1%" Barrel
Crosshairs
Figure 1
2.
Insert the Collimation
Eyepiece into the foe user far
enough that the bottom edge
of the barrel appears slightly
larger than the outer edge of
the secondary mirror when
looking through the sight
hole.
3. Rotate the eyepiece so
that the cutout on the side of
the barrel is towards an
external light source. (If
collimating at night, shine a
flashlight
'
through
the
cutout).
~e~
p J)int
t~
cutout side of the eyepiece
at or near the sun; serious
and instant eye damage
can result.
4. Look into the sight hole
to
determine
if
the
secondary
is
positioned
directly under the focuser
tube.
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The center of the
secondary mirror should be
positioned directly under the
intersection of the cross
removed.
The figure labels the major parts of a
hairs of the Collimation Eyepiece, it will need to
typical Newtonian telescope.
However,
what you
be adjusted.
This
is
usually done by rotating the
see when looking through your
teles~01'e
will
threaded rod that holds the secondary holder.
depend on the manufacturer of the telescope. For
Additionally, the threaded rod can slide up and
example, many Celestron models use a single
stalk
down through the spider for adjustments in the
to support the secondary mirror instead of a four
other axis.
To adjust a stalk-type secondary
v~e
spider. Therefore, when looking through the
holder, there is usually a center boit that can be
focuser you would see a single vane leading out to
loosened to allow rotation of the secondary
holder.
the secondary mirror as opposed to four vanes.
5. Next, you need to adjust the tilt of the secondary
mirror so that
the entire
reflection
of
the primary
mirror is visible in the secondary mirror. Use the
hairs. If the secondary is not centered in the cross
Celestron International, 2835 Columbia
Street,
Torrance, CA 90503· Phone (310) 328-9560 • Fax (310) 212-5835