![]() If Galileo were around today, he would surely be amazed at NASA's exploration of our solar system and beyond.Īfter learning of the newly invented "spyglass," a device that made far objects appear closer, Galileo soon figured out how it worked and built his own, improved version. Galileo sparked the birth of modern astronomy with his observations of the Moon, phases of Venus, moons around Jupiter, sunspots, and the news that seemingly countless individual stars make up the Milky Way Galaxy. Optical coating: Thin layers applied to mirrors, filters, and lenses to avoid reflections, as well as absorb certain colors.Born in 1564, Italian astronomer Galileo Galilei's observations of our solar system and the Milky Way have revolutionized our understanding of our place in the Universe.Metallizing: A way of coating mirrors for high-efficiency light reflection.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.Eyepiece: Performs the final focus correction before the light reaches the eye.Focuser: Allows the user to adjust the focus by moving the eyepiece along the optical axis.Filter wheel: One manner to easily insert filters into the optical train. ![]() Astronomical filter: Used to select specific colors (or light frequencies) for astrophotography.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.Field flattener a correcting lens used to reduce field curvature in refracting telescopes for astrophotography.Coma corrector a correcting lens used to reduce coma distortion in fast reflecting telescopes.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.Star Diagonal: Used to change the angle of the light coming out of a telescope, for easier viewing.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.Field lens: A correcting lens placed just before the image plane of a telescope.Subsequent (sometimes optional) components realign, segment, or in some way modify the light of an incoming image: ![]() 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. 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. ![]()
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