ORION 5660 SkyGlow Broadband Filter for Schmidt-Cassegrains Instruction Manual
- June 6, 2024
- Orion
Table of Contents
ORION 5660 SkyGlow Broadband Filter for Schmidt-Cassegrains Instruction
Manual
#5660 1.25″ SkyGlow Broadband Filter
#5659 2″ SkyGlow Broadband Filter
#5658 SkyGlow Broadband Filter for Schmidt-Cassegrains
#5654 1.25″ UltraBlock Narrowband Filter
#5657 2″ UltraBlock Narrowband Filter
#5656 UltraBlock Narrowband Filter for Schmidt-Cassegrains
The SkyGlow and UltraBlock Series of filters allows light from nebulas and other deep-space objects to pass through them while blocking light from street lights and other undesirable light sources.
The SkyGlow Broadband Filter is useful in areas of moderate light pollution like nearby street lights. It blocks the most common undesirable light pollution, while passing other desirable wavelengths such as Hydrogen Alpha, Hydrogen Beta, and Doubly Ionized Oxygen.
It is designed for both visual and photographic use.
The UltraBlock Filter is a narrow band transmission filter with very high (99.9%) blocking of Mercury and Sodium emission pollution bands, and very high transmission of critical Hydrogen Beta and Ionized Oxygen. It is most useful in areas of extreme light pollution like cities and busy streets. The UltraBlock Filter is particularly well suited for observing all plantary and emission nebulas. It is not generally recommended for photography.
Mounting the 1.25″ or 2″ Filter
Thread the filter into the barrel of your standard 1.25″ or 2″ eyepieces and
use your eyepieces normally.
Mounting the Schmidt-Cassegrain Filter
Thread the filter onto the rear cell where you normally attach your visual
back or T-adapter. The filter provides the same threads as the rear cell of
your Schmidt-Cassegrain, so you can continue to use any of your standard
accessories as before.
The Importance of Dark Adaptation
Allowing your eyes to dark-adapt is the key to getting the most from your
light pollution filter. Allow your eyes to dark-adapt for about 20-30 minutes
before you use the filter. Once the pupil in your eye opens up, you’ll be able
to take full advantage of the benefits of the filter. Remember, the instant
you glance at a bright object like a street lamp or bright flashlight bulb,
your eyes lose their dark adaptation. You have to wait another 20-30 minutes
for it to return. Locate the scope away from direct illumination by street
lights. Set up in the “shadows” of buildings and other objects.
What You Will See
These filters improve contrast between sky and object but will not actually
make the object brighter. Expect a very dark sky background and a somewhat
dimmer but high-contrast image. The filters perform best on emission objects
like the Orion and Trifid nebulas in winter, and the Lagoon or Dumbbell
nebulas in summer. Try these nebulas for your first use of the filter. Our
SkyGlow and UltraBlock filters improve the contrast of most objects, but have
considerably less effect on galaxies and stars. The coatings on the filters
are specifically formulated for emission-type objects. Remember to use low
power and longer focal-length eyepieces.
Care of Your SkyGlow and UltraBlock Filters
Avoid contacting the coated glass surface. Keep the filter in its protective
storage box when you are not using it. Use compressed air to blow off dust
particles. If the glass surface accumulates oily dirt, use lens cleaning fluid
and tissue as instructed in their package directions.
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. 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 modified, nor does it apply to normal wear and tear. This warranty gives you specific 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
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 – USA
Toll Free USA & Canada:
800-447-1001
International: +1(831) 763-7000
Customer Support: support@telescope.com
Copyright © 2021 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.
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