Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes.

The Astro Fi 127 is a computerized alt-azimuth Maksutov-Cassegrain telescope perfect for Astronomy at home or when travelling being both powerful and compact. The Astro Fi offers dazzling views of craters on the Moon, the rings of Saturn, and deep sky objects

Introducing the brand new RVO Horizon® 1.0x Field Flattener with integrated rotator to suit the RVO Horizon® 72 ED refractor. This high quality flattener will provide a beautifully flat field across the full width which is ideal for widefield imaging.

The brand new RVO Horizon® Finder/Guide scope. Guide with ease with this superb combination finderscope. This high quality 50mm Horizon Guide comes complete with a 24mm illuminated reticle eyepiece, bracket with 6 point delrin tipped adjusters on a vixen style clamp

Introducing the brand new RVO Horizon 72 ED, a fantastic ED refractor ideal for widefield imaging. Thanks to the high quality FPL-53 glass, you can ensure high contrast, sharp views each and every time.

Introducing the brand new RVO Horizon 72 ED, a fantastic ED refractor ideal for widefield imaging. Thanks to the high quality FPL-53 glass, you can ensure high contrast, sharp views each and every time.

130MM (5.1") F/900 NEWTONIAN REFLECTOR TELESCOPE

Includes Skywatcher RA Economy Drive

Magnifications (with optics supplied): x36, x72, x90, x180
Highest Practical Power (Potential): x260

Brand new 0.8x adjustable reducer flattener by William Optics to suit the Zenithstar 73 series. Comes complete with integrated rotator and 2" filter holder.

ALMA stand for Atacama Large Millimetre/submillimetre Array and is the most powerful telescope for observing the cool Universe, molecular gas and dust.

Aurora australis are natural light displays in the Earth's sky, usually visible around the around the Antarctic region. Auroras occur when the Earth's magnetosphere is disturbed by the solar wind.

The disc shows Earth from above the Christmas and Cocos Islands, not far from Indonesia's capital Jakarta. A bright full moon is visible in the back. Sun, the viewer, Earth and the Moon are almost on one line.

While flowers, butterflies and stars are all older than humans, floriculture has its roots in Babylonian times. The Hanging Gardens of Babylon are one of the Seven Ancient Wonders of the World. From there on, the Roman emperor Tiberius built the first greenhouse around 30 AD.

The oldest hot air balloon festival is the Vredefeesten in the Belgian city of Sint-Niklaas. It has been held since 1948 on the first weekend of September. Today, there are over one hundred such festivals all over the world.

The subphylum Medusozoa includes certain gelatinous members. Their life begins as free-floating larva. Once, attached to a site, the larva grows as polyp. The polyp then strobilates, the body is segmented into multiple medusae. These medusae are known as jellyfish.

The history of space exploration dates back to 1610 when Galileo Galilei used a telescope to make the discovery of Jupiter's moons, lunar craters and the phases of Venus.

Total solar eclipses occur somewhere on Earth on average every 18 months. But on a given place on Earth, they only occur once every 360 to 410 years. And even then, with a speed of the Moon's shadow of over 1700 km/h, they only last up to 7 minutes and 30 seconds.

The William Optics 0.8x Reducer / Flattener is compatible with the Z126, GT153, GT102, GLT156 & FLT132 to provide a sharp flat field ideal for widefield imaging.

Replacement leg brace for the CPC tripods. Genuine Celestron part for easy repairs and maintenance.

For the vast majority of us, we live in cities or locations with a lot of street lights. Light pollution in the night sky can significantly degrade contrast in astronomical images.

The Antlia H-Alpha 3.5nm filter is suitable for imaging of H-Alpha nebulas from observation sites with light pollution and from dark sites as well, only allow 3.5nm bandwidth high transmission at a center wavelength of 656.3nm.

Antlia narrowband filters are designed to enhance the contrast. Contrast brings out faint features by reducing the background – the narrower the filter, the better.

Antlia LRGB series are high quality colour filters specially designed for deep space photography of black and white cameras. Available in 1.25", 2", 31mm and 36mm formats.

The Antlia Oxygen III 3.5nm filter is suitable for imaging of Oxygen III nebulas from observation sites with light pollution and from dark sites as well, only allow 3.5nm bandwidth high transmission at a center wavelength of 500.7nm.

The Antlia Sulfur II 3.5nm filter is suitable for imaging of Sulfur II nebulas from observation sites with light pollution and from dark sites as well, only allow 3.5nm bandwidth high transmission at a center wavelength of 671.6nm.