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A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .
What is a Refractor Telescope? Simply put, a refractor is a type of telescope that uses a lens to bend (or refract) light to a point. The point where the light path intersects is called the “focal point”, and is where your eyepiece, camera, or diagonal would go.
Renowned for their low-maintenance design, sharp image quality, and very good performance when observing the Moon, planets, and double stars, refractor telescopes provide a reliable and user-friendly experience for both novice and experienced astronomers.
A refracting telescope, or a refractor, uses a combination of lenses to produce images of distant objects, e.g., stars and planets that would otherwise not be visible with the human eye. A simple refracting telescope is made up of two lenses, which are called the objective and the eyepiece.
Refractor telescopes are the best known historically since Galileo Galilei used the single element refractor for his study of the moon, the planet Jupiter, and solar observations. They are commercially available from 50mm diameter to 150mm (2.4 to 6 inches).
In its simplest form, a telescope consists of 2 optical elements—an objective and an eyepiece separated by the sum of their focal lengths. These may be either refractive or reflective elements (lenses or mirrors, respectively). While the objective always has positive power, the eyepiece may have either positive or negative power.
quality short refractors → Refractors are still used in astronomy for wide field small diameter systems, and the same technology is used to correct for aberrations in wide field reflecting telescopes.
At its core, a refracting telescope uses lenses to gather and focus light from distant objects. This simple yet powerful principle allows us to see faraway celestial bodies as if they were much closer. Before detailing how refractors work, we’ll look at some key concepts: Refracting telescopes work by bending light.
A refractor telescope is composed of two lenses; an objective lens and an eyepiece. Light travels through the objective lens and is slightly bent (refracted) to create a focal point for the eyepiece to receive.
Refractor telescopes, also known simply as refractors, are among the most iconic and historically significant instruments in astronomy. Their elegant design and ease of use have made them a favorite for both amateur and professional astronomers.