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Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.
It was first proposed in 1817 by the mathematician Carl Friedrich Gauss for a refracting telescope design, but was seldom implemented and is better known as the basis for the Double-Gauss lens first proposed in 1888 by Alvan Graham Clark, which is a four-element, four-group compound lens that uses a symmetric pair of Gauss lenses.
The lenses usually come from defective or old photocopiers, allowing for the objective to be obtained for free or at a low cost. They are usually modest diameter lenses, ranging from 50mm to 60mm, of short focal length, good for use in a portable, wide-field telescope, but unsuitable for higher magnifications. Given the use of good components ...
The refracting telescope which uses lenses to form an image. [27] The reflecting telescope which uses an arrangement of mirrors to form an image. [28] The catadioptric telescope which uses mirrors combined with lenses to form an image. A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel lens to ...
The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
Catadioptric telescopes, which use a combination of lenses and mirrors to form the image; essentially a combination of refracting and reflecting telescopes. Each type of telescope suffers from different types of aberration ; refracting telescopes have chromatic aberration , which causes colors to be shown on edges separating light and dark ...
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A triplet lens A Steinheil triplet telescope eyepiece. The three lenses may be cemented together, as in the Steinheil triplet (optimized for finite conjugate ratio) or the Hastings triplet (optimized for infinite conjugate ratio). [2] Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. The former has the advantage ...