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 ...

Well, any of us who has ever looked through a telescope could say the same, for the two principal types in use today were developed by giants: the refractor by Galileo and the reflector by Newton.

View the planets and night skies from home - Heavens above! Your guide to the best telescopes for stargazing, created for all astronomy enthusiasts ...

Refracting telescopes use lenses - combining at least ... The primary mirror's curve is ground to a simple shape, usually a sphere. Ordinarily, a spherical mirror would introduce aberrations ...