The journey of astronomical telescopes began in the early 17th century when Galileo Galilei crafted his first refracting ...

From magnification to light-gathering, here’s how to make the decision between buying a telescope or a monocular for ...

Designers of refracting telescopes figured out, for one, that by using two different kinds of glass together in the objective lens, they could cause the red and blue ends of the spectrum to ...

The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...