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.

Orion StarBlast 4.5

Due back in -1 days on December 10, 2017 (Sunday).

The Orion StarBlast 4.5 EQ reflector telescope is suitable for beginner and intermediate astronomers. It comes with a sturdy EQ-1 equatorial tracking mount and adjustable-height tripod. Included are two eyepieces from the Orion Expanse series - a 15mm and 6mm - which have a large 66 degree apparent field of view. The included 15mm Expanse telescope eyepiece provides 30x power magnification, while the 6mm Expanse eyepiece bumps up the power all the way to 75x magnification.  An included Orion EZ Finder II reflex sight makes it easy to effectively aim the StarBlast 4.5 Equatorial Reflector Telescope anywhere in the night sky. The EZ Finder II projects a small red-dot onto a viewing window so all you have to do is move the telescope until the red-dot is aimed at the area of sky you wish to view through the telescope.

Celestron StarHopper 8

Currently there are 0 requests to borrow this.

The Star Hopper Dobsonian telescopes are designed for beginners who seek the best possible view of the faint Deep Sky objects while on a constrained budget. These include advanced features that an experienced observer will appreciate.

 

Coronado Personal Solar Telescope

Currently there are 0 requests to borrow this.

The Coronado Personal Solar Telescope provides the ability to experience interesting details of the Sun, including sun spots and solar prominences. The PST has a bandpass of <1.0 angstrom and is quite thermally stable, requiring very little setup time. The PST will show you prominences, active regions, filaments, as well as other surface details.

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.

Orion StarMax 127 EQ

Due back in 22 days on January 02, 2018 (Tuesday).

127mm (5") aperture combined with a very long 1540mm focal length make the StarMax 127 a Maksutov-Cassegrain telescope with multiple proficiencies. Ideal telescope for sharply detailed views of planets such as Mars, Jupiter, and Saturn, as well as the Moon and brighter deep -sky gems. High-resolution imaging and visual performance in a telescope only 14.5" long!. Includes sturdy adjustable tripod and AstroView equatorial (EQ) mount for convenient slow-motion celestial tracking. Includes a 25mm Sirius Plossl 1.25" telescope eyepiece, 6x30 finder scope, 90-degree mirror diagonal, soft case for the optical tube and accessories, EQ mount polar -alignment scope, Starry Night software, and more!

Edmund Astroscan

Due back in 27 days on January 07, 2018 (Sunday).

The Edmund Scientific Astroscan 4 1/8" Telescope comes in a basic package that includes the telescope, an open sight target finger, a cast-aluminum tabletop base that's padded to prevent scratches on sensitive surfaces, a user's manual, an eyepiece and a carrying bag. The Astroscan has a three degree angle of view at 16X and makes a great beginner's scope requiring virtually no setup. It is very light-weight and perfect for small children.

Celestron NexStar 6 SE

Due back in 40 days on January 20, 2018 (Saturday).

Portability and serious performance come together in the NexStar 6 SE. Celestron's first new Schmidt-Cassegrain optical system in over a decade is now available in a high performance Altazimuth computerized telescope. With a total weight of 30 lbs including the tripod, the ultra portable 6 SE features a precision optical system with 1500mm focal length (f/10) and offers 44% more light gathering than a 5" telescope.

Meade 8 LX200 EMC

Currently there are 1 requests to borrow this.

The Meade 8 LX200 EMC Schmidt-Cassegrain telescope is suitable for members experienced with medium to large sized computerized telescope.  This telescope is great for the visual astronomer to observe the moon, planets as well as nebulae, star clusters and galaxies.

It is loaned out fully equipped with a wide selection of eyepieces and filters as well as a JMI motofocus, an Astro chair, and astronomy books.

Orion Resolux 10.5x70 Astronomy Binoculars

Currently there are 1 requests to borrow this.

Resolux binoculars are our new favorite astro binoculars (and equally superb for long-distance daytime viewing), combining high-resolution, flat-field optics with rugged mechanical construction and the strict JTII spec for collimation. They are fully waterproof, and nitrogen purged to prevent internal lens fogging. The BAK-4 prisms and advanced multi-coatings on all optical surfaces really drink in the light. The eyepieces focus individually, and with 18mm or more of eye relief on each model, even eyeglass wearers will see the full field of view. The Resolux's all-metal housing is armored with thick rubber to ensure a secure, comfortable grip. Each binocular comes with tethered lens caps, heavy-duty tripod adapter, and neck strap.

These rugged 10.5-power Orion Resolux astronomical binoculars provide high-resolution views with a nice flat-field. Fully waterproof and nitrogen purged construction prevents lens fogging in damp conditions. High-quality BAK-4 prisms and advanced multi-coatings on all optical surfaces provide maximum light throughput for bright views rich in contrast. Orion's 10.5x70 Resolux binoculars are still hand holdable for short viewing sessions, and have a nice 5.0-degree field of view.

Celestron NexStar 114 SLT

Currently there are 1 requests to borrow this.

With the light-gathering power of an 114 mm aperture, the 114 SLT comes with a fully computerized hand control with a database of over 4,000 celestial objects. With its pre-assembled, adjustable steel tripod, the NexStar 114 SLT can be up and ready to use in a matter of minutes. The SkyAlign alignment technology and the included StarPointer Finderscope with a red LED, makes aligning a breeze. Compact and lightweight in design, this scope can produce images bright enough to reveal Messier objects and also works well for planetary viewing.

Orion SkyQuest XT10i

Currently there are 1 requests to borrow this.

The Orion SkyQuest XT10i IntelliScope Dobsonian Reflector features a fairly large 10" apperture mirror combined with the ease of use of a Dodsonian mount. The telescope includes altitude and azimuthal encoders and a computer controller for easy two start configuration and push-to navigation. With the Orion SkyQuest XT10i IntelliScope Computer Controller, the user can select an object to view from the controller's 14,000+ object database. A big, 9x50 finder scope is included to help aim the telescope. Three included telescope eyepieces, a 25mm, 17mm, and 9mm Sirius Plossl, provide you with views between 48x and 120x respectively. This telescope also includes a full aperture solar filter for safe solar viewing.

Meade ETX-125EC

Currently there are 1 requests to borrow this.

The ETX-90 Maksutov-Cassegrain offers good optical quality in an easily transported smaller apperture telescope.  The Meade AutoStar computer handbox with over 30,000 object library and a solid mount and tripod make this an excellent choice for new observers looking for a portable scope that can be set up quickly.

 

Celestron NexStar 8 GPS

Currently there are 2 requests to borrow this.

8-inch diffraction limited Schmidt-Cassegrain telescope

  • Fully computerized dual fork arm altazimuth mount
  • Ergonomic design--Comfortably move the telescope from location to location
  • Proven NexStar computer control technology; GPS alignment
  • 280 mm aperture, 2800 mm focal length

 

 

Tele Vue Eyepiece Set

Currently there are 3 requests to borrow this.

All Tele Vue eyepieces have proprietary tuned full multi-coatings, blackened lens edges, high index glasses, fold-down eyeguards, rubber grip rings, cover for the eyeguard, an undercut in the barrel for extra locking security and filter threads.

Portable Astrophotography Kit

Currently there are 3 requests to borrow this.

This is a complete portable astrophotography kit which is suitable for wide-field astro-imaging.  The equipment includes a Sky-Watcher Star Adventurer equatorial mount, Berlebach mini tripod, astronomy-modified Canon T3i with a 50mm and a 100mm lens, assorted cables, batteries, and cases (one for the mount and camera and one for the tripod).  It comes with a manual to familiarize the user with the assembly, use, and care of the Seattle Astronomical Society’s portable astrophotography equipment.

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

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: