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.

APO/Ultrastar CCD Astrophotography Kit

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

The Imaging Equipment Library is being reorganized. 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 astrophotography kit is designed for capable amateur astronomers who wish to learn the basics of imaging with CCD cameras.  It is not suitable for beginners, and the borrower needs to understand how to align and use an equatorial mount. Some prior observing or imaging experience with simpler equipment, such as a star tracker and DSLR camera, is strongly recommended.  However, this kit does include a laptop computer with the necessary drivers and the UltraStar camera is a basic, entry level CCD. 

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APO/ZWO Advanced CCD Astrophotography Kit

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

The Imaging Equipment Library is being reorganized. 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 astrophotography kit  is designed help capable amateur astronomers develop the skills requried to image deep sky objects. It is not suitable for beginners. Some prior observing or imaging experience with simpler equipment, such as a star tracker and DSLR camera, is strongly recommended. The borrower needs to understand how to align and use an equatorial mount. The borrower must supply a laptop computer and install the necessary software to operate the camera and associated equipment.  

The kit includes a Meade Series ED APO (apochromatic) 80mm refractor, a Celestron Advanced VX telescope mount, and a capable ZWO color CCD camera.  Beginner astrophotographers are encouraged to consider requesting and using our Star Tracker/DSLR kit or the the entry level (but capable) "APO/Ultrastar Astrophotography Kit",  prior to requesting this kit.

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Orion 80mm ED Refractor

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

This telescope needs service and is not currently being loaned. 

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

The Orion 80ED is a small, general purpose refractor telescope that will give sharp images of the moon and planets as well as the brighter star clusters and galaxies. ED glass improves the image contrast compared to a traditional acromat.

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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: