What Is a Refractor Telescope?

A refracting telescope is a telescope that uses a lens as an objective lens and uses refractive imaging. Refractive telescopes have a wide field of view, high contrast, and good sharpness. A refracting telescope uses a lens as the main mirror, and the light is refracted and converged at a point through the lens and the lens barrel, which is called a "focal plane". The appearance of the thin-walled long tube structure of the refracting telescope is not much different from the Galileo era a hundred years ago, but modern high-quality optical glass and multilayer coating technology allow you to experience the wonderful sky that Galileo never dreamed of. For those who want simple mechanical design, high reliability, and ease of use, refracting telescopes are a very popular design. Because the focal length is determined by the length of the mirror tube, refracting telescopes that typically exceed 4 inches will become very bulky and expensive.