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- Star_diagonal abstract "A star diagonal is an angled mirror or prism used in telescopes that allows viewing from a direction that is perpendicular to the usual eyepiece axis. It allows more convenient and comfortable viewing when the telescope is pointed at, or near the zenith (i.e. directly overhead). Also, the resulting image is right side up, but is reversed from left to right. Star diagonals are available in 1.25\" and 2\" diameters. The 2\" diagonals allow larger longer focal length low power 2 inch barrel eyepieces for a greater field of view. Star diagonals come in all price ranges, from as low as thirty dollars up to hundreds of dollars. However, even an expensive star diagonal will deliver poor performance if it is not in alignment with the optical axis of the telescope. A telescope in perfect collimation will be thrown out of collimation by a misaligned star diagonal and often this misalignment will determine the image quality of the telescope to a larger extent than the surface accuracy of the prism or mirror. Since the mirror or prism of the star diagonal is located nearly at the focal plane of the instrument, surface accuracy of greater that 1/4 wave is more in the line of advertising than any increase in optical performance. A 1/10 wave mirror or prism star diagonal that throws off the collimation of the telescope will perform worse than a 1/2 wave star diagonal that is in proper alignment.".
- Star_diagonal thumbnail Star_diagonal.jpg?width=300.
- Star_diagonal wikiPageID "7656339".
- Star_diagonal wikiPageLength "5632".
- Star_diagonal wikiPageOutDegree "14".
- Star_diagonal wikiPageRevisionID "703751209".
- Star_diagonal wikiPageWikiLink Amici_roof_prism.
- Star_diagonal wikiPageWikiLink Category:Optical_devices.
- Star_diagonal wikiPageWikiLink Chromatic_aberration.
- Star_diagonal wikiPageWikiLink Eyepiece.
- Star_diagonal wikiPageWikiLink File:Star_diagonal.jpg.
- Star_diagonal wikiPageWikiLink Focal_length.
- Star_diagonal wikiPageWikiLink Herschel_wedge.
- Star_diagonal wikiPageWikiLink List_of_telescope_parts_and_construction.
- Star_diagonal wikiPageWikiLink Maksutov_telescope.
- Star_diagonal wikiPageWikiLink Mirror.
- Star_diagonal wikiPageWikiLink Pentaprism.
- Star_diagonal wikiPageWikiLink Schmidt–Cassegrain_telescope.
- Star_diagonal wikiPageWikiLink Telescope.
- Star_diagonal wikiPageWikiLink Zenith.
- Star_diagonal wikiPageWikiLinkText "Star diagonal".
- Star_diagonal wikiPageWikiLinkText "diagonal mirror".
- Star_diagonal wikiPageWikiLinkText "star diagonal".
- Star_diagonal wikiPageUsesTemplate Template:Refimprove.
- Star_diagonal wikiPageUsesTemplate Template:Reflist.
- Star_diagonal subject Category:Optical_devices.
- Star_diagonal hypernym Perpendicular.
- Star_diagonal type Application.
- Star_diagonal type Redirect.
- Star_diagonal comment "A star diagonal is an angled mirror or prism used in telescopes that allows viewing from a direction that is perpendicular to the usual eyepiece axis. It allows more convenient and comfortable viewing when the telescope is pointed at, or near the zenith (i.e. directly overhead). Also, the resulting image is right side up, but is reversed from left to right. Star diagonals are available in 1.25\" and 2\" diameters.".
- Star_diagonal label "Star diagonal".
- Star_diagonal sameAs Q7601209.
- Star_diagonal sameAs Renvoi_coudé.
- Star_diagonal sameAs m.02680p3.
- Star_diagonal sameAs Q7601209.
- Star_diagonal wasDerivedFrom Star_diagonal?oldid=703751209.
- Star_diagonal depiction Star_diagonal.jpg.
- Star_diagonal isPrimaryTopicOf Star_diagonal.