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 Resolux 10.5x70 Astronomy Binoculars

Currently there are 2 requests to borrow this.

The Equipment Library is operating under safe COVID-19 procedures but is undergoing a reorganization.  Capacity for new loans is significantly reduced. 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. 

Large-aperture astronomical binoculars are intended for viewing star clusters, nebula, and galaxies. 

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Celestron Echelon 16x70 Binoculars

Currently there are 6 requests to borrow this.

This Kit has a long waiting list. The prime March to November Observing Season for 2021 is full.

The Equipment Library is operating under safe COVID-19 procedures but is undergoing a reorganization.  Capacity for new loans is significantly reduced. 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. 

Large-aperture astronomical binoculars are designed for viewing .star clusters, nebula, and galaxies. 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 provide pleasing views of the moon , and will show Jupiter and it's four Galilean moons. It will not show Saturn's ring (about 30 power is required to reveal this detail).

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All our equipment is in good condition!

Telescope Types

Types of telescopes

Copyright NIAAS, North Ireland Amatuer Astronomical Society

What are those numbers?

Types of telescopes

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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: