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.

None of our equipment is loaned out to any members.

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.

There is a waitlist for this equipment. New requests to borrow it are not being accepted until spring 2021.

Note: This is #2 of two identical NexStar Evolution 6 telescope kits in the SAS Equipment Library.

The Celestron NexStar Evolution 6 is a microprocessor controlled GoTo telescope. The SkyAlign alignment procedure is simple and only requires the user to point the telescope to any three bright stars.   Once aligned, the "GoTo" mode provides automatic slewing to a selected object. The telescope can be controlled using a traditional hand held controller, or it can be operated using a smart phone or tablet connected to the NexStar Evolution’s built-in WiFi network. The built-in  rechargeable battery will operate the telescope for up to 10 hours on a single charge. Ergonomic handles help with setup. Manual clutches in both altitude and azimuth offer flexibility to manually point the telescope when powered off. The 6-inch NexStar Evolution tracking accuracy is accurate enough to get started in astroimaging by attaching your DSLR camera.

The telescope also includes a "Red Dot"  finderscope for initial alignment, eyepieces, and a  good quality 1.25” star diagonal.

 

 

 

Meade ETX-125EC

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

 

There is a waitlist for this equipment. New requests to borrow it are not being accepted until spring 2021.

The Meade ETX-125EC telescope is a Maksutov-Cassegrain design that folds a relatively long focal length into a relatively short and easy to handle optical tube. The long focal length makes it easy to reach high magnification for observation of the moon and planets. The 125 mm aperature is large enough for nice views of brighter deep sky objects. The Meade AutoStar controller provides Go-To operation (Note that this AutoStar computer is an older generation and setup takes a bit of time, but it works fine for viewing the moon, the planets, and some brighter, easier to locate deep sky objects.)

Celestron NexStar Evolution 6 (#1)

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

There is a waitlist for this equipment. New requests to borrow it are not being accepted until spring 2021.

Note: This is #1 of two nearly identical NexStar Evolution 6 telescopes in the SAS Equipment Library. 

The Celestron NexStar Evolution 6 is a microprocessor controlled GoTo telescope. The SkyAlign alignment procedure is simple and only requires the user to point the telescope to any three bright stars.   Once aligned, the "GoTo" mode provides automatic slewing to a selected object. The telescope can be controlled using a traditional hand held controller, or it can be operated using a smart phone or tablet connected to the NexStar Evolution’s built-in WiFi network. The built-in  rechargeable battery will operate the telescope for up to 10 hours on a single charge. Ergonomic handles help with setup. Manual clutches in both altitude and azimuth offer flexibility to manually point the telescope when powered off. The 6-inch NexStar Evolution tracking accuracy is accurate enough to get started in astroimaging by attaching your DSLR camera.

The telescope also includes a "Red Dot"  finderscope, a  good quality 1.25” star diagonal, eyepieces, and an AC adapter.

Celestron NexStar 6 SE

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

 

There is a waitlist for this equipment. New requests to borrow it are not being accepted until spring 2021.

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. 

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: