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.

All our equipment is currently on loan to other members.

Available Eventually

The following list of equipment is currently loaned out to a member, and may include other members waiting to also borrow.

  • AWB OneSky 130mm Reflector

    Currently there are 3 requests to borrow this.

    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

    Currently there are 3 requests to borrow this.

    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.

  • Orion Resolux 10.5x70 Astronomy Binoculars

    Currently there are 2 requests to borrow this.

    Large-aperture astronomical binoculars are intended for wide angle viewing star clusters, nebula, and galaxies, but will also provide nice views of our Moon and Jupiter with it's four Galelian moons. These 70mm binoculars are heavy and an Orion parallelogram binocular mount and tripod is included.

  • Orion SkyQuest XT10g - Computerized GoTo Dobsonian

    Currently there are 2 requests to borrow this.

    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

    Currently there are 3 requests to borrow this.

    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

    Currently there are 2 requests to borrow this.

    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. 

  • Orion StarMax 127 EQ

    Currently there are 2 requests to borrow this.

    The StarMax 127 telescope has a long focal length and is ideal for observation of the moon. The equatorial mount makes it easier to track the moon and planets at high magnification, but can be confusing for beginners.

Currently Unavailable

The following list of equipment is not available to members until we are able to replace or repair parts.

  • Celestron Echelon 16x70 Binoculars

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

    There is a long waiting list for these binoculars. New requests are not being accepted.

    Large-aperture astronomical binoculars are intended for wide angle viewing star clusters, nebula, and galaxies, but will also provide nice views of our Moon and Jupiter with it's four Galelian moons. These 70mm binoculars are heavy and an Orion parallelogram binocular mount and tripod is included. 16x magnification is sufficient to provide nice views of many deep sky objects, such as the Andromeda Galaxy (M31),, the Orion Nebula (M42),  and the Great Globular Cluster in Hercules (M13). It will not show Saturn's ring (about 30 power is required to reveal this detail).

  • Celestron NexStar 6 SE

    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 Celestron 6 SE is a current model altazimuth computerized Schmidt-Cassegrain telescope. The 6 SE features a relatively long 1500mm focal length (f/10) and a total weight of 30 lbs including the tripod. 

     

  • Celestron NexStar 8 GPS

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

    Special Item- This telescope has a long waiting list. New requests are not being accepted. Contact the Equipment Manager for mor information.

    This is a heavy and bulky telescope.  It may require 2 people to lift it.

    The NexStar 8  GPS is an 8-inch aperture Schmidt-Cassegrain telescope with Celestron NexStar computer control. It is  larger adn heavier than most of the SAS loaner telescopes.  Your vehicle must accomodate three large boxes (32x20x14, 24x18x12, and 30x10x10 inches) to transport it.  The optical tube assembly is about 45 lbs.  This is not a beginner telescope.

     

  • Celestron NexStar Evolution 6 (#1)

    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 telescope kit includes eyepieces, a "Red Dot"  finderscope for initial alignment, eyepieces, and a  good quality 1.25” star diagonal. This Telescope is the first of two identical NexStar Evolution 6 telescope kits in the SAS Equipment Library.

  • Celestron NexStar Evolution 6 (#2)

    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 telescope kit includes eyepieces, a "Red Dot" finderscope for initial alignment, eyepieces, and a  good quality 1.25” star diagonal. This Telescope is the newer of two identical NexStar Evolution 6 telescope kits in the SAS Equipment Library.

     

  • Meade 8" LX200 Schmidt Cassegrain

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

    Special Item-This telescope is not currently available for checkout.

    NOTE: This is a Large and heavy telescope. The optical tube assembly includes the fork mount and weighs 43 lbs. It is stored in a plastic tub that is 30" x 20" x 16" (L,W,H).

    This is a Meade eight Inch aperture, fork mounted,  f/10 GoTo Schmidt-Cassegrain telescope. The GoTo pointing accuracy is very good but the setup and alignment directions contained in the Quick Start guide must be carefully followed. Note that this kit does not include an optional equatorial wedge, since this is not required for visual observing.

  • Meade ETX-125 #2

    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 telescope was recently acquired by SAS and is not yet ready to be loaned out. It is the second of two simialr ETX-125 telescopes in the Lending Library.

     

  • Meade ETX-125 (#1)

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

    Special Item: Please contact the Equipment Manager to borrow this telescope.

    The Meade ETX-125EC telescope is a Maksutov-Cassegrain design that folds a relatively long focal length into a relatively short optical tube. The long focal length makes it easy to reach high magnification for observation of the moon and planets. The Meade AutoStar controller provides Go-To operation (but AutoStar is an older generation and setup involves several steps),

     

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: