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INSTRUCTION MANUAL

Providing Exceptional Consumer Optical Products Since 1975

Customer Support (800)-676-1343

E-mail: support@telescope.com

Corporate Offices (831)-763-7000

P.O. Box 1815, Santa Cruz, CA 95061

100mm f/9 ED Refractor

#9975 Optical Tube Assembly

Congratulations on your purchase of an Orion 100mm f/9 ED

refractor optical tube. Your 100mm f/9 ED has been designed

with high quality optics and excellent mechanical construction.

The ED glass in the objective lens means you’ll enjoy images

with far less color distortion than those seen in a standard

refractor, and the smooth Crayford focuser will make getting

sharp images a breeze. These instructions will help you set up

and use your telescope tube.

Getting Started

The 100mm f/9 ED comes fully assembled from the factory.

The telescope’s optics have been installed and collimated, so

you should not have to make any adjustments to them.

Please keep the original shipping box! In the unlikely event

you should need to ship the telescope back to Orion for war-

ranty repair service, you should use the original packaging.

The box also makes a very good container for storing the tele-

scope when it is not in use.

Attaching the Refractor to a Tripod or Mount

Optional tube rings should be used to attach the scope to a

telescope mount. Tube rings with an inner diameter of 100mm

(3.9"), such as Orion item #7371, are needed. When using

tube rings, you should first attach them to your telescope

mount and then lay the optical tube in the tube rings.

Use of Optional Eyepieces, Diagonal, and Finder

Scope

The 100mm ED does not come with a finder scope, diagonal

or eyepieces in order to grant the user the greatest versatil-

ity in customizing the instrument to suit their tastes. However,

certain rules for using accessories still apply.

Any Orion finder scope with a dovetail bracket can be used

with the 100mm f/9 ED. Simply unthread the thumbscrew on

the dovetail mount (Figure 1) and insert the assembled finder

scope and dovetail bracket. Retighten the thumbscrew. Finder

scopes that do not use a dovetail bracket will need to be

attached by other means.

The 100mm ED can use almost any 1.25" diagonal and eye-

piece. To install a diagonal, unthread the thumbscrew on the

1.25" adapter (Figure 1) until it is flush with the interior of the

adapter. Insert the diagonal and secure it with the thumbscrew.

Then insert the eyepiece into the diagonal and secure it with

the thumbscrew.

Use of 2" Eyepieces and Diagonals

A feature of the 100mm ED is its ability to also use 2" barrel-

diameter eyepieces and diagonals. At low magnifications, 2"

eyepieces can give a wider field of view than standard 1.25"

eyepieces. This is especially desirable for observing deep-sky

objects, as many of them appear quite large, but faint. Please

note that the 100mm ED will not reach focus with the 2" eye-

pieces unless a 2" diagonal or extension tube is used.

Figure 1. The 100mm f/9 ED Refractor optical tube assembly

Dew/Glare shield

Machined aluminum lens cell

Finder scope dovetail mount

2" Crayford focuser

1.25" Eyepiece

adapter

Crayford focuser tension

thumbscrew

Focus wheel (2)

IN 247 REV A 5/04

1 2 3 4

Résumé du contenu

Page 1 - 100mm f/9 ED Refractor

INSTRUCTION MANUALProviding Exceptional Consumer Optical Products Since 1975Customer Support (800)-676-1343E-mail: [email protected] Offi

Page 2

2To use 2" eyepieces, simply loosen the two large thumbscrews on the 2" adapter (Figure 1). Once these thumbscrews are loosened, the entire

Page 3 - Specifications

3 SpecificationsOptical tube: Seamless aluminumObjective lens diameter: 100mm (3.9")Objective lens: Apochromatic, rear element made of ED glass,

Page 4

4One-Year Limited WarrantyThis 100mm f/9 ED Refractor is warranted against defects in materials or workmanship for a period of one year from the date

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Orion Hunting Equipment Manuel d'utilisateur

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