There are no moving parts on the inside of the tube, and you must manually adjust the focus by turning a knob. A digital telescope is a highly advanced gadget that takes care of all things for you.

Bausch & Lomb Company gave the University of Colorado a 10.5-inch refractor, formerly the property of Carl L. Bausch. The telescope was designed by George Saegmuller, a B&L designer, in 1912.

The eyepiece (3) then spread out (magnified) the light so that it covered a large portion the viewer's retina and thus made the image appear larger. A pair of refracting telescopes owned by Galileo.

Orion’s Dual-Speed Crayford Refractor Focuser is compatible with five of Orion’s refracting telescopes. The unit offers backlashfree movement and an 11-to-1 reduction from coarse to fine focus.

In June 2014, Chris Ray and Fred Orthlieb began the arduous task of restoring the 20-inch refracting telescope at Wesleyan University’s Van Vleck Observatory in Middletown, Connecticut. The team ...

It was a memorial to her late husband, Dr. Edward P. Burrell. The observatory houses a Warner & Swasey refracting telescope with a 13 3/8-inch objective, a 4½-inch finder and a 1-inch finder.

A crew constructed what it believes to be the world’s tallest tree made of glimmering glass. The feat took place at Yerkes Observatory — home to the world’s largest refracting telescope.

Refractor telescopes excel at viewing objects within our own solar system, such as the moon, Mars or Jupiter. However, the lenses can struggle with the faint light of distant objects, which won ...