History of Telescopes

A telescope is an optical instrument that makes distant objects appear magnified by using an arrangement of lenses or curved mirrors and a system of supports to keep them in place. The first known practical telescope was invented in the…

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How to Choose a Telescope f/number?

The f/number, or scope focal ratio, is one of the most important characteristics and specifications of a telescope. It is basically the ratio between the primary mirror diameter and the focal length of the telescope. It's a ratio, so it…

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