Equipment Library

The Seattle Astronomical Society maintains a library of small and medium size telescopes that may be checked out 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 Beginner Binoculars Camera Intermediate Maksutov Newtonian Refractor Schmidt Cassegrain Visual

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.

Restricted Equipment

Contact the Equipment Manager for more information on the following equipment.

  • Celestron NexStar Evolution 6 (#1)

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

    Not currently available for loans

    Six Inch GoTo Schmidt-Cass Telescope (SCT)

    This telescope is a premium model 6 inch NexStar telescope. The loaner kit includes eyepieces, a "Red Dot"  finderscope for initial alignment, and a  good quality 1.25” star diagonal.

  • Celestron NexStar Evolution 6 (#2)

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

    Not Available for loans

    Assigned to the SAS Outreach Team

    Six Inch GoTo Schmidt-Cass Telescope (SCT)

    This is a premium model Celestron 6 inch NexStar telescope. The loaner kit includes a "Red Dot" finderscope for initial alignment, eyepieces, and a  good quality 1.25” star diagonal.

  • Meade 8" LX200 Schmidt Cassegrain

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

    8 Inch GoTo Schmidt-Cass Telescope (SCT)

    Not Available for Loans

    This is a heavy, bulky 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).  

    Contact the Equipment Manager (equipment@seattleastro.org) for more information.

    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.

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: