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.

Available Immediately

The following list of equipment is immediately available to borrow.

Sky-Watcher Star Adventurer Mini Tracking Mount

Currently there are 1 requests to borrow this.

Star Adventurer Mini is a high precision, portable and stable tracking platform for sidereal, solar and lunar tracking with automatic DSLR shutter release control. It is useful as a tracking platform to capture wide-field images of the Milky Way, or as a compact travel mount. Star Adventurer Mini is a high precision, portable celestial tracking platform can transform almost any tripod into an equatorial mount, assisting photographers with long exposures of the night sky.

A Star Adventurer Latitude Base is included and provides a smooth and reliable way to polar align your mount. With internal gearing the Latitude Base makes aligning to the north celestial pole easy and repeatable.  A MeFoto GlobeTrotter with a ball head is also provided.

Available Soon

Available Eventually

The following list of equipment is currently loaned out to a member, and may include other members waiting to also borrow.

Advanced Astrophotography Kit - Meade 80mm Refractor

Currently there are 1 requests to borrow this.

This advanced astrophotography kit includes a Meade Series 6000 APO ED APO 80mm refractor, a Celestron Advanced VX telescope mount, a ZWO ASI294MC Pro cooled camera with a reducer/flattener, and all the necessary cables and power supply.  It comes with all the pertinent manuals to use the various gear.  This astrophotography kit is designed for imaging deep sky objects.

The Meade Series 6000 80mm APO triplet refractor is built with the observer and imager in mind.  With the three element optical design using the highest grade extra-low dispersion optical glass, false color is virtually eliminated, yielding astonishing color correction, contrast, and sharpness.

ZWO ASI120MC-S Imaging Camera

Currently there are 1 requests to borrow this.

ASI120S is a super speed and sensitive USB3.0 camera. Up to 60FPS under 1280X960 full resolution! With a peak QE of 75%, beyond ICX618 and with no FPN(Fixed pattern Noise)! Long time exposure supported up to 1000s! Full compatible with USB 2.0 USB Host!

Celestron NexStar Evolution 6

Currently there are 1 requests to borrow this.

Celestron NexStar Evolution 6 includes integrated WiFi and can be controlled with your smartphone or tablet by connecting your device to NexStar Evolution’s built-in wireless network. A SkyAlign alignment procedure is built into the Celestron mobile app for setup of the "GoTo" mode that provides automatic slewing to a selected object. Use the planetarium interface to display a list of celestial objects currently visible based on your time and location. NexStar Evolution includes its own built-in battery and will operate 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 StarPointer finderscope, a 1.25” star diagonal, eyepieces, and an AC adapter.

Currently Unavailable

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: