Orion 8956 - Manual (Page 3)

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to thread directly onto the optical tube. It may be useful to
experiment with different combinations during the day before
heading out into the field. Choose a target over ½ mile away
to ensure you are simulating distant focus.
If the focuser drawtube is fully extended and you are still
unable to achieve focus you will need to install one or more
of these extension rings. They are to be installed in-between
the focuser and optical tube. In order to install the necessary
extension ring(s) you will need to first remove the focuser from
the optical tube. Be careful not to cross-thread these pieces
when re-attaching adapters.
1. Remove the focuser by holding the focuser body with one
hand while gently turning the knurled silver grip-ring with
the other (Figure 3). Turn counter-clockwise to loosen.
2. Attach the extension ring of choice to the back end of
the tube. The optical tube has external (male) threads.
Subsequently you will use the end of the ring with internal
(female) threads to attach.
3. The exposed threads on the back of the extension rings
match that on the OTA to install additional extension rings
or to reattach the focuser.
4. Once you have added the desired number of extension
rings re-attach the focuser by aligning the silver grip-ring
over the exposed extension ring threads and tighten by
carefully turning clockwise (Figure 4a-d).
The wide variety of astronomical equipment available will
require that you add or remove some or all of the extension
rings. Individual setups will require different combinations of
extension rings be used. In general, visual applications will
require further extension than imaging. The examples listed
and pictured below are of common scenarios. Some set-
ups may require combinations different from those shown in
Figure 4.
To set up any Orion StarShoot Deep Space imagers use all
three (1 x 2" and 2 x 1") of the supplied extension rings to
reach focus. For DSLR and most visual applications use 3" of
Figure 3: Removing the focuser.
Figures 2a-d: Unpacking the Optical Tube.
Grip-ring
Focuser
body
2a
2b
2c
2d