Newtonian telescope
Newtonian reflector

With John and his brother, Henry, George had constructed effective Newtonian telescopes.

In 1721 he showed the first parabolic Newtonian telescope to the Royal Society.

A telescope with only one curved mirror, such as a Newtonian telescope, will always have aberrations.

Whereas an 8-inch Newtonian telescope would have been considered large 30 years ago, today 16-inch systems are common, and huge 32-inch systems not all that rare.

It was the prototype for a design that later came to be called a newtonian telescope.

This type of telescope is still called a Newtonian telescope.

Later on such prototype for a design came to be called a Newtonian telescope or Newton's reflector.

Newtonian telescopes are usually less expensive for any given objective diameter (or aperture) than comparable quality telescopes of other types.

There are modern commercial and amateur mount designs for Newtonian telescopes that have the "ball" built into the base of the optical tube assembly.

Isaac Newton 1668 builds the first reflecting telescope, his Newtonian telescope.