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Achromatic Telescope Objective
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Title: Remarks to the article: New Light on the Invention of the Achromatic Telescope Objective Author: Igor Nesterenko The article analysis was carried out within the confines of the replication project of the telescope, which was used by Mikhail Lomonosov at observation the transit of Venus in...
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Binoculars
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Carl Zeiss Jena 7x50 Binoctar. These binoculars were produced by the Eastern Germany Carl Zeiss company (DDR). The exit pupil size is perfect for astronomy and low-light nature watching. The rubber-armoured Porro-prism design will help protect the glasses. The multi-coated BaK-4 lenses pro...
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Early spyglasses
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Title: The mystery of the telescopes in Jan Brueghel the Elder's paintings Authors: Paolo Molaro, Pierluigi Selvelli Several early spyglasses are depicted in five paintings by Jan Brueghel the Elder completed between 1608 and 1625, as he was court painter of Archduke Albert VII of Habsburg. An op...
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Cameras
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Leica has the fastest lens Leica Camera AG, a prestigious but small German maker of high-end cameras and lenses, is going for the speed crown again, making the world's "fastest" lens for still cameras. This week, Leica said it has created a new version of its Noctilux lens with an aperture...
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Dr. John Alfred Brashear
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Reacquainting Pittsburgh's youngsters with "Uncle John" Brashear will begin in the same North Side factory where the renowned optics expert toiled over precision mirrors and lenses for Gilded Age telescopes. Historian and musician Lisa A. Miles wants to transform Brashear's vacan...
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Solar Filters
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Baader A4 AstroSolar Solar Filter Material ND 5.0 Baader Planetariums AstroSolar safety film is a specially manufactured streak- and blisterfree foil. It attains the optical performance of planeparallel glass filters. The base material is not "Mylar". High density coatings on bo...
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Barlow lenses
(Preview)
Spoiler Using Barlow lenses with your telescope (a buyer's guide)
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Seben Laser Collimator
(Preview)
The Seben Laser Collimator is a class IIIa 650nm red laser (1 - 5mW) to help with the accurate collimation of your reflector telescope. The laser is designed to fit into a standard 31.7mm (1.25") focus tube; some package deals including a 2" adaptor. It is powered with a standard CR2032 3V l...
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Telescope Tips
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Drift Alignment Drift Alignment, like ALL polar alignment techniques, is used to get the polar axis of your telescope parallel with the polar axis of the Earth. Nothing more; nothing less. It's just that it's done by watching selected stars 'drift' in Declination while viewing them. From the ty...
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Parabolic Strip Telescope
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Title: Parabolic Strip Telescope Authors: Goce Chadzitaskos We present a proposal of a new type of telescopes using a rotating parabolic strip as the primary mirror. It is the most principal modification of the design of telescopes from the times of Galileo and Newton. In order to demonstrate the b...
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CMOS chips
(Preview)
UV-transparent coating for image sensors Image sensors as used in cell phones are partially colour-blind. This is because of their coating, which prevents UV light from passing through. CMOS chips have as a result not been suitable for spectroscopy up to now. A new production process makes the coa...
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X-ray diffraction grating
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Title: First results from a next-generation off-plane X-ray diffraction grating Authors: Randall McEntaffer, Casey DeRoo, Ted Schultz, Brennan Gantner, James Tutt, Andrew Holland, Stephen O'Dell, Jessica Gaskin, Jeffrey Kolodziejczak, William W. Zhang, Kai-Wing Chan, Michael Biskach, R...
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Airy's Transit Circle
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The Airy Transit Circle was designed by George Biddell Airy, and came into use 160 years ago. The first observation was taken on 4 January 1851, three days later than George Airy had intended due to the English weather. The circle remained in continual use until 1938, and the last ever observation was...
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ON-Axis Guider
(Preview)
Cold mirror makes hot astrophotos a snap While nearly everyone enjoys a good astrophoto, the precision with which the astrograph (the telescope taking the photograph) must follow the stars is not widely appreciated. To take a good astrophoto of any but the brightest objects requires following th...
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DIY Telescope
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(Preview)
DIY Mirror Telescope Made With Vinyl Pipes and 21-inch Pot This is the Musashi 500, a do-it-yourself mirror telescope made of vinyl chloride pipes, a 21-inch metal pot and some custom-made wood and metal parts. Designed to be easily transported in five different modules, this 5.9-foot long, 44-po...
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