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- Crayford_focuser abstract "The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement. It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. The original Crayford Focuser is on display there.The Crayford focuser was initially demonstrated to the Crayford Manor House Astronomical Society, and then descriptions were published in The Journal of the British Astronomical Association (February 1971), Model Engineer magazine (May 1972) and Sky & Telescope magazine (September 1972). John Wall decided not to patent the idea, effectively donating it to the amateur astronomical community.Crayfords began to be popular among amateur telescope makers for being easy to make without any high precision machining, yet providing precise focusing with no gear slop or backlash. This trend picked up steam as commercial Crayfords, while being relatively inexpensive, proved to be superior to most rack-and-pinion devices. They became the default focusing device on many amateur telescopes just above entry level, and better. They are made in a variety of designs by companies specializing in amateur telescope supplies, with such features as dual speed focusing and interface to motorized, or robotic, focusing.".
- Crayford_focuser thumbnail Crayford_1.jpg?width=300.
- Crayford_focuser wikiPageExternalLink cmhas.wikispaces.com.
- Crayford_focuser wikiPageExternalLink 1.
- Crayford_focuser wikiPageExternalLink wall3.htm.
- Crayford_focuser wikiPageExternalLink focuser.htm.
- Crayford_focuser wikiPageExternalLink images?hl=en&q=Crayford%20focusers&um=1&ie=UTF-8&source=og&sa=N&tab=wi.
- Crayford_focuser wikiPageExternalLink product-sct-crayford-focuser-cf001.html.
- Crayford_focuser wikiPageID "7060967".
- Crayford_focuser wikiPageLength "4558".
- Crayford_focuser wikiPageOutDegree "23".
- Crayford_focuser wikiPageRevisionID "653855286".
- Crayford_focuser wikiPageWikiLink Amateur_astronomy.
- Crayford_focuser wikiPageWikiLink Amateur_telescope_making.
- Crayford_focuser wikiPageWikiLink Backlash_(engineering).
- Crayford_focuser wikiPageWikiLink Ball_bearing.
- Crayford_focuser wikiPageWikiLink Bearing_(mechanical).
- Crayford_focuser wikiPageWikiLink Camera.
- Crayford_focuser wikiPageWikiLink Category:Amateur_astronomy.
- Crayford_focuser wikiPageWikiLink Category:British_inventions.
- Crayford_focuser wikiPageWikiLink Category:Mechanisms_(engineering).
- Crayford_focuser wikiPageWikiLink Crayford.
- Crayford_focuser wikiPageWikiLink Crayford_Manor_House_Astronomical_Society.
- Crayford_focuser wikiPageWikiLink Dobsonian_telescope.
- Crayford_focuser wikiPageWikiLink Dual_speed_focuser.
- Crayford_focuser wikiPageWikiLink England.
- Crayford_focuser wikiPageWikiLink Eyepiece.
- Crayford_focuser wikiPageWikiLink Focus_(optics).
- Crayford_focuser wikiPageWikiLink John_Wall_(inventor).
- Crayford_focuser wikiPageWikiLink London.
- Crayford_focuser wikiPageWikiLink Optical_telescope.
- Crayford_focuser wikiPageWikiLink Polytetrafluoroethylene.
- Crayford_focuser wikiPageWikiLink Rack_and_pinion.
- Crayford_focuser wikiPageWikiLink File:Crayford_1.jpg.
- Crayford_focuser wikiPageWikiLinkText "Crayford focuser".
- Crayford_focuser subject Category:Amateur_astronomy.
- Crayford_focuser subject Category:British_inventions.
- Crayford_focuser subject Category:Mechanisms_(engineering).
- Crayford_focuser hypernym Mechanism.
- Crayford_focuser type Organisation.
- Crayford_focuser type Machine.
- Crayford_focuser comment "The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement.".
- Crayford_focuser label "Crayford focuser".
- Crayford_focuser sameAs Q1223634.
- Crayford_focuser sameAs Okularauszug.
- Crayford_focuser sameAs Okulárkihuzat.
- Crayford_focuser sameAs m.0h2fc9.
- Crayford_focuser sameAs Q1223634.
- Crayford_focuser wasDerivedFrom Crayford_focuser?oldid=653855286.
- Crayford_focuser depiction Crayford_1.jpg.
- Crayford_focuser isPrimaryTopicOf Crayford_focuser.