3
Specifications
Optical design:
Maksutov-Cassegrain
Aperture:150mm: (5.9")
Effective focal length:
1800mm
Focal ratio:
f/12.0
Central obstruction diameter:
47mm
Primary mirror coating:
Aluminum with SiO2 overcoat
Meniscus lens coating:
Anti-reflection multi-coatings on both sides of lens
Eyepiece adapter:
2" visual back with 1.25" adapter; accepts 2" or 1.25" accessories
Optical tube mounting plate:
Vixen-style
Tube length:
17-3/4" (45.1cm), including 2" visual back
Tube weight:
11.5 lbs.
Figure 4 a)
If the telescope’s optics are out of alignment, the view through the rear opening of the telescope will look like this.
B) When the optics
are properly collimated the view will look like this.
Front of
telescope
Secondary
mirror
Reflection of
your eye in
secondary
mirror
Secondary
reflection of
inside of tube
Reflection of
inside of tube
(misalignment)
Front of
telescope
Secondary
mirror
Reflection of
your eye in
secondary
mirror
A
B
Figure 5.
The primary mirror collimation screws of the 150mm
Maksutov-Cassegrain.
Collimation
screw pairs
Rear
opening
be attempted if you have confirmed the telescope is actually out of
collimation by performing a star test.
Note: The secondary mirror of the 150mm Maksutov-Cassegrain
is not adjustable.
Finishing Collimation
Once you have finished adjusting your telescope, you should per-
form another star test (described earlier) to check the collimation.
If your telescope appears collimated after star testing, it should
not need adjustment again unless it is roughly handled. If you
have gone through this process and your telescope is still out of
collimation, please contact Orion customer support. You may need
to return the telescope for repair or replacement (covered under
warranty for 1 year after purchase).
