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Congratulations on your purchase of an Orion
Ritchey-Chrétien astrograph!
Astroimaging
demands high contrast and center to edge image
sharpness. The Ritchey-Chrétien optical sys-
tem features precision hyperbolic mirrors with an
impressive reflectivity rating of no less than 94%.
These highly corrected optics offer virtually coma-
free performance; and multiple knife-edge baffles
provide images with superb contrast. These design
features will offer a lifetime of outstanding perfor-
mance for imaging and visual applications. The
Ritchey-Chrétien is a member of the Cassegrain
family of telescopes. This unique design offers
large-diameter optics while maintaining very short
tube lengths, making them extremely portable and
versatile.
Parts List
1 Optical tube assembly
1 2" Extension ring
2 1" Extension rings
1 Collimation eyepiece
Unpacking Your Telescope
Use care when unpacking the shipping carton. We recom-
mend keeping the boxes and all original packaging materi-
als. In the event that the telescope needs to be shipped to
another location, or returned for warranty repair, having the
proper packaging will ensure that your telescope will survive
the journey intact. Returns for refund or exchange will not be
accepted without all of the original packaging.
Your new telescope arrives double-boxed (Figures 2a-d). Make
certain you are opening from the top of the box to access the
accessories packaged in the Styrofoam shell. To access the
optical tube simply grasp the Styrofoam piece and lift it out of
the box and set it aside for the time being. Once all items have
been removed from the box take a moment to confirm that all
pieces are present and intact. Refer to the Parts List to aid in
identifying the various pieces.
Setting Up Your Telescope
Your Ritchey-Chrétien optical tube comes ready to use right
out of the box. The focuser is attached to the optical tube and
ready to accept either visual or photographic accessories.
Also included are three individual extension rings (Figure 1).
These extension rings are provided to allow multiple visual or
photographic accessories to reach focus. These are designed
Figure 1:
The Ritchey-Chrétien Optical Tube (6" shown)
Collimating eyepiece
Extension rings
Optical tube
