Ghosts in the Machine: the Astro-Tech AT111EDT...
Jun 13 2015 12:23 PM by jrbarnett
My NexStar 5 Journey
Jun 13 2015 11:29 AM by orion61
Review of the William Optics 102 GT
May 25 2015 12:22 PM by Perseus_m45
Review- Printing Astro photos on Metal with Bay...
Apr 16 2015 03:36 PM by ScenicCityPhoto
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Telescopes are typically stored and operated over a wide range of temperatures. Changing temperatures and extreme temperature ranges affect nearly all materials used in constructing telescopes, as well as the optical properties of the air in the immediate vicinity. This article discusses the two principle effects of temperature on telescope materials: (1) changes in optical and structural material dimensions with temperature, and (2) changes in optical glass refractive index with temperature. These two temperature-dependent material properties usually combine to negatively affect optical performance in refractive and catadioptric systems if not compensated for, and system optimization must account for these properties in the design phase to minimize temperature effects on telescope performance.
A. Jaegers Optical Corporation--A personal recollection Stephen L. Nightingale For many teenagers in the 1960’s, an after-school or summer job meant...MacDonald’s! As a teenage amateur astronomer and telescope nut, I had the perfect job--working for Al Jaegers at A. Jaegers Optical Corporation from 1968 to 1970.
I had purchased a QuickFinder to put on the front of the dewcap of my 100mm f/6 refractor, as I was occasionally having trouble getting to the new "correct-image" right angle optical finder I had installed earlier
The Orion SkyQuest XX14i Truss-tube Dobsonian is a fairly nice large aperture instrument for the amateur who needs something a bit bigger than what is usually offered by the solid tubed telescopes.