One-year limited warranty – Orion 7338 User Manual

Page 4

divide the focal length of the telescope by the focal length of
the eyepiece:

Telescope Focal Length (mm)

= Magnification

Eyepiece Focal Length (mm)

For example, the 100mm, which has a focal length of 600mm,
used in combination with a 25mm eyepiece, yields a power of:

600mm

= 24x

25mm

Every telescope has a useful limit of power of about 50x per
inch of aperture. Claims of higher power by some telescope
manufacturers are a misleading advertising gimmick and
should be dismissed. Keep in mind that at higher powers, an
image will always be dimmer and less sharp (this is a funda-
mental law of optics). The steadiness of the air (the “seeing”)
will limit how much magnification an image can tolerate.
Always start viewing with your lowest-power (longest focal
length) eyepiece in the telescope. After you have located and
looked at the object with it, you can try switching to a higher-
power eyepiece to ferret out more detail, if atmospheric con-
ditions permit. If the image you see is not crisp and steady,
reduce the magnification by switching to a longer-focal-length
eyepiece. As a general rule, a small but well-resolved image
will show more detail and provide a more enjoyable view than
a dim and fuzzy, overmagnified image.

Care & Maintenance
Give your telescope reasonable care and it will last a lifetime.
When not in use, keep its dust cover on as well as the dust cap
on the eyepiece opening. Store it indoors or in a dry garage.
Do not leave the telescope outside except when using it. The
optical tube is aluminum and has a smooth painted surface
that should resist scratches and smudges. If a scratch does
appear on the tube, it will not harm the telescope. Smudges
on the tube can be wiped off with standard household clean-
ers such as Windex or Formula 409.
Any quality optical lens tissue and cleaning fluid specifically
designed for multi-coated optics can be used to clean the
telescope’s objective lens as well as the lenses of the eye-
pieces and finder scope. Never use regular glass cleaner or
cleaning fluid designed for eyeglasses. Before cleaning with
fluid and tissue, however, blow any loose particles off the lens
with a blower bulb or compressed air, or lightly brush the lens
with a soft camel hair brush. Apply some cleaning fluid to a
tissue, never directly on the optics. Wipe the lens gently in
a circular motion, then remove any excess fluid with a fresh
lens tissue. Oily fingerprints and smudges may be removed
using this method. Use caution; rubbing too hard may scratch

the lens! Clean only a small area at a time, using a fresh lens
tissue on each area. Never reuse tissues.

Specifications
Objective lens:

Achromatic doublet, air-spaced

Objective lens diameter: 100mm
Objective lens coatings:

All air-to-glass surfaces coated,
with at least one surface
multi-coated

Focal length:

600mm

Focal ratio:

f/6

Baffling:

Two in optical tube, two in focuser
drawtube

Focuser:

2" dual-speed linear bearing
Crayford (with 1.25" adapter)

Tube diameter
(not including dew shield): 100mm
Tube length
(with dew shield):

20.6"

Weight:

7.1 lbs.

One-Year Limited Warranty

The Orion Deluxe 100mm f/6 Refractoris warrant-
ed 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 post-
age paid to: Orion Warranty Repair, 89 Hangar
Way, Watsonville, CA 95076. Proof of purchase
(such as a copy of the original receipt) is required.
This warranty does not apply if, in Orion’s judg-
ment, the instrument has been abused, mishan-
dled, or modified, nor does it apply to normal wear
and tear. This warranty gives you specific legal
rights, and you may also have other rights, which
vary from state to state. For further warranty ser-
vice information, contact: Orion Customer Service
(800) 676-1343; [email protected].

Orion Telescopes & Binoculars

OrionTelescopes.com

89 Hangar Way, Watsonville CA 95076

Customer Support Help Line (800) 676-1343 • Day or Evening