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Photonics Dictionary: E
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elbow telescope
A refracting telescope that uses a prism to bend the line of sight 90°.
electron telescope
An instrument that serves to produce an enlarged electron image on a fluorescent screen by focusing an infrared image of a distant object upon a photosensitive cathode.
equatorial telescope
A telescope that is mounted on an equatorial mount.
empty magnification
Magnification that is above the level of maximum useful magnification and does not contribute useful resolving power. In a visual telescope, empty magnification is any in excess of 20 D, where D =...
equatorial mount
A telescope stand equipped with a polar axis that can be set parallel to the Earth's axis of rotation and a declination axis that is at right angles to the polar axis. If the telescope is turned at a...
Erfle eyepiece
A telescopic eyepiece comprising five or six simple lenses in the form of three doublets or two doublets and a singlet.
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