Filter
Top Products
must be unthreaded slightly to the
point of where you can tilt the diagonal
holder from side-to-side by grasping
the diagonal holder with your hand and
tilt until you see the primary mirror become
as centered in the reflection of the diagonal
mirror as possible. Once you are at the best
position, thread in the 3 Phillips-head
diagonal tilt screws to lock the rotational
position. Then, if necessary, make
adjustments to these 3 Phillips-head screws
to refine the tilt-angle of the diagonal mirror
until the entire primary mirror can be seen
centered within the diagonal mirror
reflecting. When the diagonal mirror is
correctly aligned, it will look like Fig. 14
(Note: The primary mirror is shown out
of alignment).
C. PRIMARY MIRROR ADJUSTMENTS
If the diagonal mirror (1, Fig. 16) and the
reflection of the primary mirror (2, Fig. 16)
appear centered within the drawtube (3, Fig.
16), but the reflection of your eye and the
reflection of the diagonal mirror (4, Fig. 16)
appear off center, you will need to adjust the
primary mirror tilt Phillips-head screws of
the primary mirror cell (3, Fig. 13). These
primary tilt screws are located behind the
primary mirror, at the lower end of the main
tube. To adjust the primary mirror tilt
screws, first unscrew several turns, the 3
hex-head primary mirror cell locking screws
(2, Fig. 13) that are next to each primary
mirror tilt Phillips-head screw. Then by trial-
and-error, turn the primary mirror tilt
Phillips-head screws (3, Fig. 13) until you
develop a feel for which way to turn each
screw to center the reflection of your eye.
Once centered, as in Fig. 14, turn the 3 hex-
head primary mirror cell locking screws (2,
Fig. 13) to relock the tilt-angle adjustment.
D. STAR TESTING THE COLLIMATION
With the collimation performed, you will
want to test the accuracy of the alignment
on a star. Use the 25mm eyepiece and point
the telescope at a moderately bright (second
or third magnitude) star, then center the star
image in the telescope's field-of-view. With
the star centered follow the method below:
• Bring the star image slowly out of focus
until one or more rings are visible around
the central disc. If the collimation was
performed correctly, the central star disk
and rings will be concentric circles, with a
dark spot dead center within the out-of-
focus star disk (this is the shadow of the
secondary mirror), as shown in Fig. 17C.
(An improperly aligned telescope will
reveal elongated circles (Fig. 17A), with an
off-center dark shadow.)
• If the out-of-focus star disk appears
elongated (Fig. 17A), you will need to
adjust the primary mirror Phillips-head
tilt screws of the primary mirror cell
(3, Fig. 13)
• To adjust the primary mirror tilt screws
(3, Fig. 13), first unscrew several turns
the 3 hex-head primary mirror cell
locking screws (2, Fig. 13), to allow free
turning movement of the tilt knobs.
• Using the flexible cable controls move the
telescope until the star image is at the
edge of the field-of-view in the eyepiece,
as in Fig. 17B.
• As you make adjustments to the primary
mirror tilt screws (3, Fig. 13), you will
notice that the out-of-focus star disk
18
Looking at or near the Sunwill cause irreversabledamage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving.
Meade114EQAR 3/28/07 9:52 AM Page 20