Equipment Library

The Seattle Astronomical Society maintains a library of small and medium size telescopes that may be checked out for a period of 1 month by members in good standing. If you are new to astronomy, this is an excellent way to learn how to use a telescope and to begin viewing the wonders of the night sky, without having to invest immediately in a telescope of your own. To check out a telescope, please check out our equipment available for loan.

If you have any questions about borrowing equipment, or do not see a specific piece of equipment please reach out to our Equipment Manager.

See the complete equipment list in alphabetical order.

Keywords

You can narrow your search of our equipment library by selecting any one of the below keywords.

Astrophotography Binoculars Camera Maksutov Newtonian Refractor Schmidt Cassegrain Visual

All our equipment is currently on loan to other members.

None of our equipment is loaned out to any members.

Currently Unavailable

Currently, new on-line requests for the following equipment kits are not being accepted. Contact the Equipment Manager for more information on borrowing this equipment.

  • AWB OneSky 130mm Reflector

    Note  This item is being serviced and it is not available for check out.

    Note: This telescope has a long wait list. Contact the Equipment Manager for more information.

    This telescope is suitable for all ages and is a good choice for viewing the moon, planets, and bright deep sky objects. It has a Dobsonian style mounting that is compact and intuitive to use. A red-dot reflex sight and a seet of eyepieces is included.. It is designed to be placed on a small table or similar support and does not come with a tripod.

  • Celestron StarHopper 8

    Note  This item is being serviced and it is not available for check out.

    This telescope is being refurbished and new requests are not being accepted. at this time.

    This Celestron Star Hopper Dobsonian is an 8 inch Newtonian telescope on a Dobson style mount. The telescope includes a Telrad finder that is intuitive to use and works well for pointing the telescope at the moon, planets, and brighter stars.

    NOTE: This is a heavy and bulky telescope and may not fit in smaller cars. The tube is 52" long by 10" diameter and the Base is 22" in diameter by 23" high.

  • Edmund Astroscan

    Note  This item is being serviced and it is not available for check out.

    This telescope needs repairs and is not currently available for loans.

    The Edmund Scientific Astroscan 4 1/8" telescope comes in a basic package that includes the telescope, a unit power red circle sight (Rigel Quik Point), a cast-aluminum tabletop base that's padded to prevent scratches on sensitive surfaces, a user's manual, two eyepieces, and a carrying bag. The Astroscan has a focal length of 445mm and makes a great "grab and go" scope requiring virtually no setup.  Unfortunately the telescope is slightly but permenately out of collimation and is not suitable for hig power viewing, but it works OK with the provided eyepieces.. A low power eyepiece (16x) provides a three degree angle true field of view and a medium power eyepiece provides 25x. The Astroscan provides good views of large star clusters and nebula, such as the Double Cluster, the Andromeda galaxy, and the Great Nebula in Orion. complex, all of which can be seen from the suburbs of Seattle. It will show Jupiter and it's moons, but does not quite resolve Saturn's ring system.

     

  • Orion SkyQuest XT10g - Computerized GoTo Dobsonian

    Note  This item is being serviced and it is not available for check out.

    Special Item-Contact the Equipment Manager to Borrow this telescope.

    The XT10g is a 10" aperture Newtonian telescope in a motorized Go-To mount.  A red dot reflex sight finder and eyepieces are included. 

    This is a  very heavy and bulky telescope and it is usually loaned for extended periods. The base is large and weighs nearly 40 lbs. The optical tube weighs 30 lbs and is about 12 inches in diameter by 48 inches long. It may require 2 people to lift it and a bigger vehicle to transport it.

  • Orion SkyQuest XT10i

    Note  This item is being serviced and it is not available for check out.

    Special Item-Contact the Equipment Manager to Borrow this telescope.

    This is a heavy and bulky telescope and it is usually loaned for extended periods.  It may require 2 people to lift it and a bigger vehicle to transport it.

    The Orion SkyQuest XT10i IntelliScope is a 10" aperture Dobsonian Reflector with a Push-To computer system for aiming the telescope. 

  • Orion StarBlast 4.5

    Note  This item is being serviced and it is not available for check out.

    New Requests for this telescope are not currently being accepted. Contact the Equipment Manager for information.

    The Orion StarBlast 4.5 EQ reflector telescope comes with a lightweight equatorial tracking mount that is advantagous for advanced amateurs but is not intuitive to use.  A "red dot" finder is provided to aim the telescope. 

Telescope Types

Types of telescopes

Copyright NIAAS, North Ireland Amatuer Astronomical Society

What are those numbers?

Types of telescopes

Copyright 2008-2012 Stormthecastle.com

The f-ratio is the focal length divided by the diameter of the telescope. Magnification is the focal length of the telescope divided by the focal length of the eyepiece.

Example

To find the f-ratio of a telescope 10 " in diameter with a 45" focal length:

Divide 45 " F.L. by10" D. to get an f-ratio of 4.5.

Compute Magnification

First, convert focal length to mm: 45" = 1146 mm, then:

1146 mm focal length divided by 35 mm eyepiece equals 33 magnification.

More Information

If you are interested in learning more about telescopes, we recommend: