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Bahtinov mask
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A Bahtinov mask is a telescope focusing aid for astrophotography. The device consists of a disk made of opaque material with slots cut out in a specific pattern that is fitted into the light path of a telescope. The focusing mask uses the optics diffraction spike pattern to aid in focusing. The mask w...
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Han Dynasty gnomon
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Oldest Astronomical Instruments Discovered in China A few pieces of "lacquerware of unknown names" unearthed 35 years ago from a tomb of the Western Han Dynasty in Fuyang City, Anhui Province, are found to be a gnomon with template and an equatorial device for the positional measureme...
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Telescope mounts
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Sky-Watcher EQ-6 equatorial mount The Sky-Watcher EQ-6 equatorial mount is the first of its kind, and is top of our range of equatorial mounts. It is a precision instrument capable of carrying massive payloads (up to 25kg) but at the same time is very reasonably priced. The mount is excellent for vis...
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Finderscopes
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A finder scope is a little telescope that mounts on your main telescope. Today, we cover red-dot and Telrad finders. These devices, also called unit-power finders because they don't magnify an image, are much more intuitive for beginners and in many cases much easier to use. Especially in dark sky....
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Filters
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Lunar and Planetary Filters To bring out contrast in the clouds of Jupiter and Saturn, or see fine detail on the surface of Mars, you should consider a set of inexpensive coloured-glass planetary filters that thread into your eyepieces. Here's a quick guide to choosing a few filters that will help y...
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Terahertz imaging
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ThruVision is the market leader in passive standoff terahertz imaging solutions. The ThruVision T4000 camera offers discreet or covert screening of people from a distance. The T4000 is optimised to form images of concealed objects on people at stand-off distances between 3m and 15m. [url=http...
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Photography
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Wiki's guide to photographing the stars Read more
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Teleskopos
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How the telescope got its name On 14th April, 1611, Galileo Galilei was guest of honour at a prodigious banquette thrown by Prince Frederico Cesi founder and president of the Academy of the Lynxes an exclusive society dedicated to scholarly pursuits to which Galileo would be appointed to, as a memb...
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Antique telescopes
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18th-century bone telescopes discovered Scientists have unearthed five bone-made instruments dating to the 18th century which they say are finely crafted telescopes that may have been used to gaze at objects on land or sea. Ranging in length from roughly three to five inches, the telescopes -- d...
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Orion Optics
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We are moving to a new factory at the end of this month. Not too far away, Newcastle under Lyme, just down the road in North Staffs. The production areas of the factory are on one level and are over 200% larger than current floor space in our units in Crewe. The units here in Crewe are rented, the new factory...
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Observing Tips
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It has been said that beginner telescope observers often look only for 15 seconds, on average, at an object. And of all the objects in the sky only Jupiter, Saturn, the Orion nebula, the Pleiades and the Moon (for N. hemispherians) are the main targets (mostly by being bright and easily findable). The...
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Astronomy with Small Telescopes
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Title: Astronomy with Small Telescopes
Authors: Bohdan Paczynski
revised v3
The All Sky Automated Survey (ASAS) is monitoring all sky to about 14 mag with a cadence of about 1 day; it has discovered about 10^5 variable stars, most of them new. The instrument used for the sur...
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DIY Magnetometer
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The Northern lights, or Aurora, are beautiful to watch at night. But they can happen during daylight as well. If you want to predict when they will occur, try your hand at building this simple DIY detector. How to make a Aurora Detector: To make your own magnetometer all you need is a magnet with a mirror...
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Refractor vs reflector
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Achromatic refractor vs Newtonian reflector - Jupiter Ed ~ The refactor views are more typical of a 3" or 4" telescope. Generally, a refractor is the telescope of choice for planetary viewing. An achromatic correcting filter w...
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Helios 102mm Refractor
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Helios Refractor - Startravel (102mm (4") F/500) Refractor Telescope The Helios 102 (now Sky-Watcher) compact rich field scope features an excellent 102mm fully multi-coated objective lens. The short tube Startravel-102 provides 62.5% greater light gathering capability than 80mm t...
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