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A N E M P L O Y E E - O W N E D C O M P A N Y
Copyright © 2020 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes & Binoculars.
INSTRUCTION MANUAL
BARLOW LENSES
®
An Orion barlow lens is a simple concave (negative) lens that amplifies the magnifying power of
any telescope eyepiece it's used with. It works by reducing the convergence of the light cone
heading into the eyepiece. In this way it increases the focal length of the telescope. Since mag-
nification is determined by dividing the telescope's focal length by the eyepiece's focal length,
you can see that by doubling the telescope's focal length, a 2x barlow lens doubles the magni-
fication of the system for a given eyepiece.
In this way, a 2x barlow can effectively double the number of magnifications available to you from
a set of eyepieces. For example, if you have eyepieces with focal lengths of 26mm, 18mm, and
10mm, using a 2x barlow will give you the equivalent of 13mm, 9mm, and 5mm eyepieces—like
getting three more eyepieces for the price of one barlow!
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International: +1(831) 763-7000
Customer Support: support@telescope.com
IN 017 Rev D 03/09
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Table of Contents
Related Manuals for Orion Shorty 08711d
Summary of Contents for Orion Shorty 08711d
- Page 1 A N E M P L O Y E E - O W N E D C O M P A N Y Copyright © 2020 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes &...
- Page 2 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 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.
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