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- Lens_sag abstract "Lens sag is a problem that sometimes afflicts very large refracting telescopes. It is the equivalent of mirror sag in reflecting telescopes. It occurs when the physical weight of the glass causes a distortion in the shape of the lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by the entire opposite face, making mirror sag much less of a problem. One expensive solution to lens sag is to place the telescope in orbit around the Earth.The technical limit concerning lens sag was reached at the Yerkes refractor (1897) with an aperture of 40\" (102 cm), where the sagging already causes small optical distortions. The 1890s therefore mark the end of the great refractors era.".
- Lens_sag wikiPageID "1420492".
- Lens_sag wikiPageLength "981".
- Lens_sag wikiPageOutDegree "8".
- Lens_sag wikiPageRevisionID "668465524".
- Lens_sag wikiPageWikiLink Category:Telescopes.
- Lens_sag wikiPageWikiLink Earth.
- Lens_sag wikiPageWikiLink Great_refractor.
- Lens_sag wikiPageWikiLink Lens_(optics).
- Lens_sag wikiPageWikiLink Orbit.
- Lens_sag wikiPageWikiLink Reflecting_telescope.
- Lens_sag wikiPageWikiLink Refracting_telescope.
- Lens_sag wikiPageWikiLink Yerkes_Observatory.
- Lens_sag wikiPageWikiLinkText "Lens sag".
- Lens_sag wikiPageWikiLinkText "lens sag".
- Lens_sag auto "yes".
- Lens_sag date "December 2009".
- Lens_sag wikiPageUsesTemplate Template:Confuse.
- Lens_sag wikiPageUsesTemplate Template:Optics-stub.
- Lens_sag wikiPageUsesTemplate Template:Unreferenced_stub.
- Lens_sag subject Category:Telescopes.
- Lens_sag hypernym Problem.
- Lens_sag type Disease.
- Lens_sag type Thing.
- Lens_sag comment "Lens sag is a problem that sometimes afflicts very large refracting telescopes. It is the equivalent of mirror sag in reflecting telescopes. It occurs when the physical weight of the glass causes a distortion in the shape of the lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by the entire opposite face, making mirror sag much less of a problem.".
- Lens_sag label "Lens sag".
- Lens_sag differentFrom Sagitta_(optics).
- Lens_sag sameAs Q1826998.
- Lens_sag sameAs Linsendurchbiegung.
- Lens_sag sameAs m.0502wr.
- Lens_sag sameAs Q1826998.
- Lens_sag wasDerivedFrom Lens_sag?oldid=668465524.
- Lens_sag isPrimaryTopicOf Lens_sag.