"4761"^^ . . . . . . . . . . "1076751869"^^ . . . . . . . . . . . . . . . "Mirrors and lenses are the critical light-bending components of a telescope. \n* Objective: The first lens or curved mirror that collects and focuses the incoming light. \n* Primary lens: The objective of a refracting telescope. \n* Primary mirror: The objective of a reflecting telescope. \n* Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. \n* Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope. \n* Meniscus corrector: A meniscus-shaped corrector plate usually used in the Maksutov telescope. \n* Focusing mask: A full aperture mask temporarily placed before the primary mirror to aid in focusing the telescope. \n* Bahtinov mask \n* Carey mask \n* Hartmann mask \n* Sub-aperture "@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "List of telescope parts and construction"@en . . . . . . . . . . . . . . . "Mirrors and lenses are the critical light-bending components of a telescope. \n* Objective: The first lens or curved mirror that collects and focuses the incoming light. \n* Primary lens: The objective of a refracting telescope. \n* Primary mirror: The objective of a reflecting telescope. \n* Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. \n* Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope. \n* Meniscus corrector: A meniscus-shaped corrector plate usually used in the Maksutov telescope. \n* Focusing mask: A full aperture mask temporarily placed before the primary mirror to aid in focusing the telescope. \n* Bahtinov mask \n* Carey mask \n* Hartmann mask \n* Sub-aperture corrector: One or a series of corrective lens (sometimes combined with a corrective curved mirror) placed after (near the focus) a primary mirror designed to correct the optical aberrations of the mirror. These can be just a small version of the corrector plate, but since they are usually used in a Cassegrain configuration in front of the secondary mirror they require additional modification since the light passes through them twice. \n* Secondary mirror \n* Mirror#Instruments \n* Curved mirror \n* Honeycomb mirror \n* Liquid mirror \n* Parabolic reflector Subsequent (sometimes optional) components realign, segment, or in some way modify the light of an incoming image: \n* Field lens: A correcting lens placed just before the image plane of a telescope. \n* Telecompressor or focal reducer: Optical element to decrease the telescope's focal length and magnification (usually by a fixed percentage) and widen the field of view, providing opposite effects of a Barlow lens. \n* Star Diagonal: Used to change the angle of the light coming out of a telescope, for easier viewing. \n* Herschel Wedge: Similar to a star diagonal with a wedge-shaped unsilvered prism reflector that reduces incoming light by up to 95% for solar viewing. \n* a correcting lens used to reduce coma distortion in fast reflecting telescopes. \n* a correcting lens used to reduce field curvature in refracting telescopes for astrophotography. \n* Barlow lens: Optical element to increase the telescope's focal length and magnification, narrow the field of view and reduce coma distortion, providing opposite effects of a telecompressor. \n* Astronomical filter: Used to select specific colors (or light frequencies) for astrophotography. \n* : One manner to easily insert filters into the optical train. Mostly used for photography. \n* Focuser: Allows the user to adjust the focus by moving the eyepiece along the optical axis. \n* Eyepiece: Performs the final focus correction before the light reaches the eye. \n* Charge-coupled device (CCD): A light-sensitive integrated circuit digital sensor (commonly used in digital cameras) that turns light into an electrical charge used to collection image data. Generally applicable to all items: \n* Metallizing: A way of coating mirrors for high-efficiency light reflection. \n* Optical coating: Thin layers applied to mirrors, filters, and lenses to avoid reflections, as well as absorb certain colors."@en . . . . . "25214307"^^ .