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appendix B: Centering the Secondary
Mirror under the Focuser
Centering the secondary mirror under the focuser is an adjustment that can be
made with the aid of the LPCS, but it requires marking the center of the second-
ary mirror in the same way the center of the primary mirror was marked. This is
generally undesirable due to the large area of the supplied collimation targets
compared to the total area of the secondary mirror. Since centering the second-
ary mirror under the focuser is an adjustment that very rarely, if ever, needs
to be done, we recommend simply making this adjustment by eye. Check the
collimation instructions in your telescope's manual for the procedure to do this.
However, if you wish to use the LPCS for centering the secondary mirror under
the focuser, read on. First, you must mark the center of the secondary mirror.
Do this by first removing the secondary mirror from the telescope and making
a paper template the same way you made a template for the primary mirror.
Then use the template and one of the remaining collimation targets to mark
the secondary mirror's center. Reinstall the secondary mirror once it has been
marked. Next, place the LPCS into the telescope's focuser and turn it on. Now,
peer into the optical tube and look at the primary mirror. Notice the reflection of
the secondary mirror on the primary mirror; you will see a bright red spot on the
secondary mirror where the laser beam is reflecting off it. The red spot should
be exactly at the center of the collimation target on the secondary mirror. If it is
not, you will need to make adjustments to the secondary mirror's position until it
is. For adjustments perpendicular to the optical axis, lengthen and shorten the
spider vanes. For adjustments parallel to the optical axis, loosen or tighten the
center screw of the spider hub. You may also need to adjust the rotation of the
secondary mirror relative to the focuser.
This Orion product is warranted against defects in materials or workmanship for a period of one
year from the date of purchase. This warranty is for the benefit of the original retail purchaser only.
During this warranty period Orion Telescopes & Binoculars will repair or replace, at Orion's option,
any warranted instrument that proves to be defective, provided it is returned postage paid. Proof
of purchase (such as a copy of the original receipt) is required. This warranty is only valid in the
country of purchase.
This warranty does not apply if, in Orion's judgment, the instrument has been abused, mishandled,
or modified, nor does it apply to normal wear and tear. This warranty gives you specific legal rights.
It is not intended to remove or restrict your other legal rights under applicable local consumer law;
your state or national statutory consumer rights governing the sale of consumer goods remain fully
applicable.
For further warranty information, please visit www.OrionTelescopes.com/warranty.
Customer Support Help Line (800) 676-1343
12
One-Year Limited Warranty
OrionTelescopes.com
89 Hangar Way, Watsonville, CA 95076
© 2013 Orion Telescopes & Binoculars
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