ORION TELESCOPES & BINOCULARS Stratus 08244d User manual

Orion
Eyepieces
Corporate Offices: 89 Hangar Way,
Watsonville CA 95076 - USA
Toll Free USA & Canada: [phone]
International: [phone]
Customer Support: [email protected]
Copyright © 2020 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
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Instruction Manual
Thank you for your purchase of an
Orion eyepiece. This instruction
sheet is intended as a reference for
any Orion eyepiece, and is not writ-
ten for a specic model. Below are
a few simple formulas to help you
determine the magnication and
eld of view for your equipment,
along with helpful tips for proper
care of your eyepieces.
Francais
IN 418 Rev. A 07/20

Magnification
The magnication is based on a simple formula:
Mag = fTel ÷ fEye
where fTel is the focal length of the telescope, and fEye is the focal length of the
eyepiece.
So for example, the Orion SkyQuest XT8" has as focal length of 1200mm, and if
a 10mm eyepiece is inserted, the power will be 120x (1200mm ÷ 10mm).
The upper limit of magnication of any telescope is about 50x per inch (or 2x per
mm) of aperture. Anything higher, and detail becomes lost as the resolution limit
is exceeded. Also, on a night of good “seeing conditions” (steady air, no wind
or jet stream passing overhead) the approximate limit of magnication that the
atmosphere can support is around 300x. So a 90mm refractor can be pushed to
180x, and a 10" reector could theoretically do 500x, but usually the atmosphere
will only support 300x.
Field of View
The true eld of view (in degrees) is based on another simple formula:
True Field (in degrees) = aFov ÷ Mag
where aFov is the apparent eld of view of the eyepiece, and Mag is the
Magnication that the eyepiece provides.
The apparent eld of view is a specication of every eyepiece, sometimes writ-
ten on the eyepiece next to the focal length, but always listed as a spec for each
eyepiece on our website. So for example, the Sirius Plossl eyepieces all feature
a 52° apparent eld of view, and the Magnication of the 10mm Sirius on the
SkyQuest XT8" is 120x. So the true eld of view for this combination is 0.43°
(52° ÷ 120x).
Use of Filters
Filters can be threaded into the bottom of all Orion eyepieces. Lunar lters can
be used to boost contrast on the moon’s surface, color lters can be used for
planetary detail, and light pollution and nebulae lters can be used to block out
the ambient light and boost contrast for deep-sky objects.
Care and Maintenance
Let the eyepiece dry after use if dew is present. If it is capped with moisture on
the surface of the glass, fungus may grow on the optical coatings, eating them
away. Therefore, place caps on the eyepiece only when you are sure it is com-
pletely dry. For storage, keep the eyepiece in an appropriate enclosure--prefera-
bly a dedicated eyepiece case with foam padding.

Cleaning the Eyepiece
The lens elements of Orion eyepieces are coated with anti-reection coatings,
which can be damaged with careless handling. Avoid touching lens surfaces with
your ngers or any coarse material. Clean the lenses 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 eyeglasses or house-
hold use. Do not disassemble the eyepiece to clean it, with the exception of the
chrome barrel, which may be unscrewed to better access the lens surfaces.
To clean the lens surfaces, rst blow air on them with a blower bulb or com-
pressed air to remove any large particles. Then brush the lens surfaces with a
soft lens brush and blow air on them again to remove any dislodged particles.
Put two drops of lens cleaning uid on a sheet of lens tissue (never directly on
the lenses). Wipe the lenses gently with a circular motion, taking care to avoid
undue pressure or rubbing, which can scratch the coatings. Quickly remove the
excess uid by wiping with a clean, dry lens tissue.
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Toll Free USA & Canada: [phone]
International: [phone]
Customer Support: [email protected]
Copyright © 2020 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 period 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 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 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.