3
getting Started
The 90mm refractor comes nearly fully assembled from the
factory. The telescope’s optics have been installed and col-
limated, so you should not have to make any adjustments to
them. Open the box and inspect the contents to make sure
all of the items in the parts list are present.
Please keep the original shipping box. In the unlikely event
you should need to ship the telescope back to Orion for war-
ranty repair service, you should use the original packaging.
The box also makes a very good container for storing the
telescope when it is not in use.
installing the Finder Scope
To place the finder scope in the finder scope bracket (Figure
2a.), first unthread the two black nylon thumbscrews until
the screw ends are flush with the inside diameter of the
bracket. Place the O-ring that comes on the base of the
bracket over the body of the finder scope until it seats into
the slot on the middle of the finder scope. Slide the eye-
piece end (narrow end) of the finder scope into the end of
the bracket’s cylinder opposite the adjustment screws while
pulling the chrome, spring-loaded tensioner on the bracket
with your fingers (Figure 2b.) Push the finder scope through
the bracket until the O-ring seats just inside the front open-
ing of the bracket’s cylinder. Now, release the tensioner and
tighten the two black nylon screws a couple of turns each to
secure the finder scope in place. Secure the bracket to the
dovetail mount on the optical tube with the knurled thumb-
screw on the dovetail mount.
installing the Diagonal and Eyepiece
Insert the 45° correct-image diagonal into the focuser draw-
tube and secure it with the knurled thumbscrew on the
drawtube. Then insert the 25mm Sirius Plössl eyepiece into
the diagonal and secure it in place with the thumbscrews on
the diagonal. (Always loosen the thumbscrews before rotat-
ing or removing the diagonal or an eyepiece.)
Mounting the telescope
The 90mm refractor can be easily mounted on altazimuth
mounts, like the Orion VersaGo, which utilize a dovetail hold-
er. Attach the included tube rings to the dovetail mounting
plate with the included hex head screws. Be sure to place a
lock washer and then a flat washer onto each screw before
attaching. Insert the screws (with washers) through the
holes in the plate and thread them into the base of the tube
rings (Figure 2c). Tightening the screws requires a 10mm
crescent wrench or an adjustable crescent wrench. Place
the optical tube into the open rings. Close the rings, and
use the silver clamping knob on each tube ring to secure
the telescope. The dovetail mounting plate now connected
to the 90mm refractor connects directly to the VersaGo’s
dovetail holder.
The 90mm refractor can also be mounted on Orion equatorial
mounts using the dovetail mounting plate. Follow the previous
directions to couple the telescope to the mounting plate with
the tube rings.
An equatorial mount is desirable for astronomical viewing
as it allows easy manual and/or motorized tracking of celes-
Figure 2b.
Inserting the finder scope into the finder scope bracket.
Figure 2c.
Attaching the dovetail mounting plate.
Dovetail
mounting
plate
Hex head screws
Tube ring clamping
knobs
Figure 2a.
The 6x26 correct-image finder scope and bracket
Focus
lock-ring
Alignment thumbscrews
Tensioner
Piggyback camera adapter
Flat washer
Lock washer
