10
Upper ends of a pair of truss rods
7.
Lift the nose assembly into position to permit the truss rod thumbscrews to be threaded into the nose assembly
feet.
(Use one arm to support the nose assembly from the bottom end, and the other hand to thread the
thumbscrews.)
Determine which screw-hole level is appropriate to adjust the focal point of the scope (see
below). Be sure to secure all three pairs of truss rods at the same screw-hole level.
For best results one of the three feet has been indexed with a small punch hole. This is the North foot. When
attaching the nose assembly, this foot should be placed on the north side for best collimation throughout the
rotation of the nose assembly. For the Southern Hemisphere this foot should be on the south side.
Indexed nose assembly foot
Focal Points and Eyepieces
The three screw holes in each foot of the nose assembly permit the nose assembly to be properly placed to adjust the
focal point of the telescope relative to the focuser. The upper thumbscrew hole places the focal plane farthest from
the diagonal (secondary) mirror, effective for use with a camera with off-axis guider. The middle hole is appropriate
for a camera without off-axis guider as well as for visual focus. The lower hole, which places the focal plane closest to
the diagonal mirror, is intended for visual work.
The NGT is ready for use with 2-inch eyepieces.
A 1.25" adapter, included with the focuser, allows the use of
smaller-diameter eyepieces. A 2-inch extension tube is also provided to extend the focuser's travel, if necessary.
Note that if you cannot achieve focus with the additional travel, you may need to reposition the height of the nose
assembly as described above.
Summary of Contents for NGT-12.5
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