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.

Keywords

Equipment currently shown is filtered to only those tagged with Astrophotography

Available Immediately

The following list of equipment is immediately available to borrow.

Sky-Watcher Star Adventurer Mini Tracking Mount

Currently there are 0 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.

Whether you’re looking for a tracking platform to capture wide-field images of the Milky Way, or seeking a compact travel mount, Star Adventurer Mini is a necessity for astrophotographers of every skill level. This high precision, portable celestial tracking platform can transform almost any tripod into an equatorial mount, assisting photographers with long exposures of the night sky. Star Adventurer Mini breaks from the mold of traditional equatorial mounts with an abundance of add on accessories to complement wide-field astrophotography, nightscape images or time-lapse photography.

A Star Adventurer Latitude Base in provided. The Star Adventurer Latitude (EQ) Base 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.

ZWO ASI120MC-S Imaging Camera

Due back in 41 days on May 29, 2019 (Wednesday).

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 is the first Schmidt-Cassegrain telescope with integrated WiFi. Without the hand control, slew to all the best celestial objects with a tap of your smartphone or tablet. Connect your device to NexStar Evolution’s built-in wireless network, and explore the universe with the Celestron mobile app for iOS and Android.

Use the planetarium interface to view the night sky in real time or display a list of celestial objects currently visible based on your time and location. Our proprietary SkyAlign alignment procedure is built right into the Celestron mobile app, so you’re ready to observe within minutes.

NexStar Evolution includes its own built-in battery. With this ultra-long life lithium-iron phosphate battery, you’ll be able to enjoy stargazing marathons up to 10 hours on a single charge.

Setting up your NexStar Evolution is quick and painless with large, ergonomic handles. Manual clutches in both altitude and azimuth offer greater flexibility to manually point the telescope when powered off.

The 6-inch NexStar Evolution is an excellent way to get started in astroimaging. NexStar Evolution’s tracking accuracy is so impressive, you can capture images of deep-sky objects like the Orion Nebula by simply attaching your DSLR camera.

The Schmidt-Cassegrain optical system offers bright, sharp views with StarBright XLT optical coatings—a great choice for visual observers and budding astroimagers alike.

NexStar Evolution is equipped with 4 auxiliary ports--2 on top of the fork and 2 on the bottom. A classic NexStar+ hand control is included, but is not necessary when using NexStar Evolution with the mobile app. The telescope also includes a StarPointer finderscope, two 1.25” Plossl eyepieces, a 1.25” star diagonal, and an AC adapter.

Advanced Astrophotography Kit - Meade 80mm Refractor

Currently there are 2 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.

Currently Unavailable

All our equipment is in good condition!

Telescope Types

Types of telescopes

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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: