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.

Advanced CCD Astrophotography Kit with 80mm APO

Currently there are 4 requests to borrow this.

NOTE: Equipment Library operation is currently suspended during this pandemic.

This astrophotography kit is designed for imaging deep sky objects by capable amateur astronomers. It  includes a Meade Series 6000 APO ED APO (apochromatic) 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. The borrower should understand how to align and use an equatorial mount and must supply a laptop computer to operate the camera. The short effective focal length of the system allows unguided exposures of a few minutes, which can then be stacked during post processing 

The Meade Series 6000 80mm APO triplet refractor uses extra-low dispersion optical glass to provide excellent color correction, contrast, and sharpness.

Explore Scientific AR102mm Refractor

Currently there are 4 requests to borrow this.

NOTE: Equipment Library operation is currently suspended during this pandemic.

The Explore Scientific AR Series telescopes are classic doublet achromatic f/6.5 refractors designed to provide low and medium magnification, wide field views of the sky. 

The Explore Scientific AR Series telescopes include a 2" dual-speed Crayford-style focuser, a one-piece 2" diagonal with 99% dielectric coatings, an 8 X 50 non-illuminated straight -thru finderscope and quick release bracket, and a cradle ring assembly with Vixen-style dovetail mount.

A Twilight I mount is included. The Twilight I is a light-duty alt-azimuth mount and tripod designed to quickly and easily accept small to medium sized refractors.  Slow-motion control cables are attached on the vertical and horizontal axes, and are easy to turn during the night.

Available Soon

Available Eventually

None of our equipment is loaned out to any members.

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: