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2020astro podcast

Small Telescopes - Newtonian Reflector

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Newtonian Reflector Telescopes

Newtonians (also known as catoptrics) usually use a concave parabolic primary mirror to collect and focus incoming light onto a flat secondary (diagonal) mirror that in turn reflects the image out of an opening at the side of the main tube and into the eyepiece. The basic design has been around for hundreds of years and invented by, you guessed it Sir Isaac Newton in 1689.

A bit like the picture above his one was a 150mm diameter and used his discovery of Newton's Rings to grind and check that the mirrors flat.

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