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.

Orion SkyQuest XT10g - Computerized GoTo Dobsonian

Currently there are 1 requests to borrow this.

This Equipment is very heavy and is usually loaned for extended periods. The prime March to November Observing Season for 2021 is full. It may be some time before you can borrow this equipment.

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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. 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.

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Currently Unavailable

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

Celestron NexStar Evolution 6 (#2)

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

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full It may be some time before you can borrow this equipment.

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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.

 

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Celestron NexStar Evolution 6 (#1)

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

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full. It may be some time before you can borrow this equipment.

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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.

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Meade 8" LX200 Schmidt Cassegrain

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

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full. It may be some time before you can borrow this equipment.. 

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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.

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Celestron NexStar 6 SE

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

 

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full. It may be some time before you can borrow this equipment.

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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. 

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Celestron NexStar 8 GPS

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

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full. It may be some time before you can borrow this equipment.

Please do not submit more than two requests at any one time without Equipment Manager approval. 

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..

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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: