The first telescopes used lenses, known as refracting telescopes. Small instruments – whether for amateur astronomers starting out or people keen to look at distant mountains or spy on their neighbors ...

Though still only in the prototype stage, this flat lens could one day be used on space telescopes, and perhaps even on ...

Standing on shoulders Both types of telescopes—Galileo's refractor and Newton's reflector—underwent improvements in the coming centuries. Designers of refracting telescopes figured out ...

Unlike refracting telescopes (whose lenses are very expensive), the Newtonian reflector offers the possibility of owning a large aperture telescope while staying within a modest budget.

It was soon realized that what was to become known as chromatic aberration was a limiting factor in refracting telescopes, and that this could be overcome by making lenses with longer focal length ...

Beginning in Spring 2000, when the department major in astronomy ... and-narrow refractor and its replacement short-and-fat reflector. In order to fully appreciate the fine detail and workmanship that ...

Astronomy at Alfred University has a long history, dating back to the Civil War when the University purchased its first telescope, a 9-inch refractor made by Henry Fitz. Since the mid-1960s the ...

9.53 inch Clark Refractor The main telescope is the original 9.53 inch ... be used to determine the latitude and longitude of the observatory. Meridian transit telescopes were also used for precise ...

A refractor telescope on a fold-up tripod that ... images sharp when the optics move (which often happens to lightweight telescopes). What the DS1 does have, however, is some photo adjustment ...

For the first time, a flat telescope lens has been produced that represents colors accurately, offering a way to make less bulky lenses that could be sent into space cheaply. The first telescopes ...