Orion 8727 User manual

Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Toll Free USA & Canada: [phone]
International: [phone]
Customer Support: [email protected]
Copyright © 2021 Orion Telescopes & Binoculars.All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modied or adapted, without the prior written consent of Orion Telescopes & Binoculars.
AN EMPLOYEE-OWNED COMPANY
Orion High-Reflectivity Mirror
Star Diagonals
#8727 2" version w/dielectric coatings
#8879 1.25" version w/enhanced aluminum coatings
#8880 1.25" version w/dielectric coatings
Congratulations on your purchase of a high-quality Orion star
diagonal. Your diagonal utilizes a precision at mirror with high-
reectivity coatings and top quality machined housings. Using a
star diagonal with your telescope provides a comfortable view-
ing angle for astronomical observation. In addition, a diagonal
is required to reach focus in many short-focal length refractors.
The diagonal will work with refractors, Schmidt-Cassegrains, and
Maksutov-Cassegrains, but not Newtonian reector telescopes.
How to Use the Star Diagonal
Remove the cover caps and place the barrel of the star diagonal
directly into the telescope’s focuser. Secure it in place with the
thumbscrew(s) on the focuser. Insert your eyepiece into the of
the diagonal and secure the eyepiece with the diagonal’s thumb-
screw. Notice there is a brass compression ring inside the open-
ing of the diagonal, interior to the thumbscrew. This ring prevents
the thumbscrew from marring the barrel of your eyepiece.
If you would like to adjust the position of the diagonal to accom-
modate observers of different heights, simply loosen the
thumbscrew(s) on your telescope’s focuser, rotate the diagonal,
and re-secure your telescope’s thumbscrew(s). Before rotating the
diagonal, however, make sure the thumbscrew on the diagonal is
tightened, or the eyepiece may fall out and onto the ground!
The 2" star diagonal will accept either 2" or 1.25" eyepieces using
the supplied 1.25" eyepiece adapter. If using 2" eyepieces, remove
the 1.25" adapter from the diagonal.
Focusing
Focus with your telescope’s focusing knob. The 1.25" diagonal
requires approximately 9cm inward focus travel relative to the
eyepiece’s focus position without the diagonal. The 2" model will
require slightly more inward focus travel, as it requires approxi-
mately 11cm relative to the eyepiece’s focus position without the
diagonal.
Image Orientation
The star diagonal reverses the image from left-to-right. This rever-
sal is hardly noticeable when viewing the night sky. If you are
printing star maps on your computer, you may want to have your
program ip the star map to match your eyepiece’s reversed view
through the diagonal.
Use of Filters
The 1.25" diagonal is threaded to accept Orion 1.25" lters on its
barrel. If you use lters directly on the star diagonal, it will prevent
having to remove and reinstall lters when switching eyepieces.
The 2" diagonal will also accept lters (Orion 2" size only), either
on the barrel of the diagonal itself or on the bottom of the 1.25"
eyepiece adapter.
Care and Maintenance
Although the star diagonal is quite durable, it should avoid pro-
longed, unnecessary exposure to the elements. Keep the diago-
nal capped on both ends when not in use, preferably in a foam-
lined eyepiece case. It is also recommended to leave the diagonal
in a dry place with caps off overnight to let it completely dry out
after use. Store the instrument in a cool, dry place; storage in a
humid environment can result in degradation of the optical coat-
ings on the mirror. This is not covered by the warranty.
The Orion 2" High Reectivity Mirror Star Diagonal
Thumbscrews
Barrel
1.25" Eyepiece adapter
The Orion 1.25" High Reectivity Mirror Star Diagonal
Brass compression ring
Thumbscrew
Barrel
Brass compression rings
INSTRUCTION MANUAL
IN 278 Rev B 01/09

Cleaning the Diagonal
The mirror of the star diagonal is coated with high-reectivity
coatings which can be damaged with careless handling. Avoid
touching mirror surfaces with your ngers or any coarse material.
Clean the mirrors only if they get noticeably dirty. Always use lens
cleaning tissue and uid specically designed for telescope opti-
cal coatings. Do not use regular tissue or uids made for eyeglass
or household use.
To properly clean the star diagonal’s mirror, the mirror must be
removed from its housing. To do this, rst remove the four Phillips
head screws from the bottom of the diagonal. For 2" models, you
will also need to remove the two button head cap screws from the
side of the diagonal (requires a 2mm or 5/64" hex key). The mir-
ror is gently supported by foam padding and can be removed by
simply sliding it out of the diagonal housing.
Once the mirror is removed from its housing, blow compressed
air over the surface to remove dust particles and debris, then
gently wipe away smudges with telescope optical cleaning uid
and tissue. Apply some uid to a tissue and gently wipe the mirror
surface. Use another clean, dry piece of tissue to gently wipe up
any uid remaining. Repeat if necessary. Use caution; wiping with
too much applied pressure may cause scratches.
Specifications
Enhanced aluminum coating: 97% reectivity
Dielectric coating: 99% reectivity
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Toll Free USA & Canada: [phone]
International: [phone]
Customer Support: [email protected]
Copyright © 2021 Orion Telescopes & Binoculars.All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modied or adapted, without the prior written consent of Orion Telescopes & Binoculars.
AN EMPLOYEE-OWNED COMPANY
One-Year Limited Warranty
This Orion product is warranted against defects in materials or workmanship for a peri-
od of one year from the date of purchase. This warranty is for the benet 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 defec-
tive, provided it is returned postage paid. Proof of purchase (such as a copy of the origi-
nal 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 modied, nor does it apply to normal wear and tear. This warranty gives
you specic 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.