Orion Observer 90mm Instruction Manual page 8

Azimuth
adjustment
knob
Base
.
Figure 12
Attach the red dot scope to the Observer 114mm EQ by
pushing the bracket into the finder scope base. Inset shows the power
switch.
Lock ring
Objective lens cell
Thumb nuts
.
Figure 13
Attach the 6x30 finder scope to the Observer 90mm or
134mm EQ with the two round thumb nuts.
scale is indicating the latitude of your observing location.
If you don't know your latitude, you can look it up on the
internet. For example, if your latitude is 35° North, set
the pointer to 35. Then retighten the latitude lock knob.
The latitude setting should not have to be adjusted again
unless you move to a different viewing location some
distance away.
3. Loosen the Dec. lock knob and rotate the telescope optical
tube until it is parallel with the R.A. axis, as it is for the
photos on the cover. The pointer on the Dec. setting circle
should read 90°. Retighten the Dec. lock knob.
8
Power switch
Altitude
adjustment
knob
Alignment thumbscrews
Focuser
Focus wheel
.
Figure 14
Install the star diagonal in the drawtube collar of the
Observer 90mm EQ, then place an eyepiece in the diagonal and secure
it with the thumbscrew.
Focus wheels
.
Figure 15
For the two reflector models, the eyepiece is inserted in the
drawtube collar and tightened with the two thumbscrews.
4. Loosen the azimuth lock knob at the base of the
equatorial mount (Figure 5) a half turn or so and rotate
the mount so the R.A. axis points roughly at Polaris. If
you cannot see Polaris directly from your observing site,
consult a compass and rotate the mount so the telescope
points North. Retighten the azimuth lock knob.
The equatorial mount is now polar aligned. From this
point on in your observing session, you should not make
any further adjustments to the azimuth or the latitude of
the mount, nor should you move the tripod. Doing so will
ruin the polar alignment. The telescope should be moved
only about its R.A. and Dec. axes.
Using the R.A. and Dec. Slow-Motion Control
Cables
The R.A. and Dec. slow-motion control cables allow fine adjust-
ment of the telescope's position to center objects within the field
of view. Before using the cables, manually "slew" the mount to
Drawtube
collar
Eyepiece
Star diagonal
Eyepiece
Drawtube
collar