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.
Figure 5
Slide the dovetail bar on the optical tube assembly into
the mount's saddle and clamp it tight with the saddle lock knob.
ring behind the objective lens cell. The finder scope's focus
should not need to be adjusted again.
Which Diagonal Should I Use?
The VersaGo GX 80 comes with two diagonals: a 90-degree
mirror "star" diagonal and a 45-degree correct-image prism
diagonal (Figure 9). Having two diagonals gives the VersaGo
GX 80 tremendous versatility for use both in the daytime and
at night.
For daytime use we recommend using the 45-degree correct-
image diagonal. Its internal amici prism produces a correctly
oriented image in the eyepiece, which is important for observ-
ing land-based scenes. And its 45-degree viewing angle is
more appropriate for observing when the telescope is often
oriented parallel to the ground (Figure 10A). For stargazing,
when the telescope is often pointed upward, the 90-degree
diagonal is recommended, as it provides a more comfortable
viewing angle for high-altitude targets (Figure 10B).
Note that the 90-degree star diagonal, which contains mirrors,
not a prism, produces an image that appears reversed left to
right. This is normal for astronomical refractors that utilize a
star diagonal. Note also that with the 90-degree star diagonal
the image in the telescope eyepiece will be oriented differently
from the image in the "correct-image" finder scope.
IV. Operating the VersaGo
GX 80
The VersaGo GX 80 Altazimuth Refractor is designed for easy
up-down and left-right manual panning. The panhandle can be
used to move the telescope in any direction. While there is no
tension adjustment on the azimuth (horizontal) axis, there is
a tension adjustment knob on the altitude (vertical) axis (see
Figure 11). Loosen the tension adjustment knob slightly to
allow easier altitude motion, and tighten the knob to increase
the friction to the desired level.
Dovetail bar
Saddle
lock knob
Saddle
Groove
A
Pull
spring
pin
B
C
Figure 6. A) Place the rubber O-ring on the finder scope and push
it into the groove. B) Slide the finder
scope tube into the bracket as shown and, while pulling back the
spring pin, push the tube until the O-ring seats just inside the bracket
cylinder. C) The assembled finder scope.
O-ring
Thumbscrew
Bracket cylinder
5
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