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- Bahtinov_mask abstract "The Bahtinov mask is a device used to focus small astronomical telescopes accurately.It was invented by Russian amateur astrophotographer Pavel Bahtinov in 2005 (http://www.astronomy.ru/forum/index.php/topic,10421.0.html). Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.The telescope is pointed at a bright star, and a mask is placed in front of the telescope's objective (e.g. primary mirror).The mask consists of three separate grids, positioned in such a way that the grids produce three angled diffraction spikes at the focal plane of the instrument for each bright image element. As the instrument's focus is changed the central spike appears to move from one side of the star to the other. In reality, all three spikes move but the central spike moves in the opposite direction to the two spikes forming the 'X'. Optimum focus is achieved when the middle spike is centered between the other two spikes.Small deviations from optimal focus are easily visible. For astrophotography, a digital image can be analyzed by software to locate the alignment of the spikes to sub-pixel resolution.The direction of this displacement indicates the direction of the necessary focus correction. Rotating the mask through 180° will reverse the direction of spike movement, so it is easier to use if placed on the telescope with consistent orientation. The mask must be removed after accurate focus is achieved.A very bright star and very dark sky is required for to produce clearly visible diffraction spikes.In the example below, the center pattern shows good focus. The central spike is noticeably displaced from the center position in the left and right images.".
- Bahtinov_mask thumbnail Bahtinov_mask.jpg?width=300.
- Bahtinov_mask wikiPageExternalLink MaskGen.aspx.
- Bahtinov_mask wikiPageExternalLink ?p=376.
- Bahtinov_mask wikiPageExternalLink ?p=660.
- Bahtinov_mask wikiPageID "23628595".
- Bahtinov_mask wikiPageLength "3248".
- Bahtinov_mask wikiPageOutDegree "14".
- Bahtinov_mask wikiPageRevisionID "677133940".
- Bahtinov_mask wikiPageWikiLink Astrograph.
- Bahtinov_mask wikiPageWikiLink Astrophotography.
- Bahtinov_mask wikiPageWikiLink Cardinal_point_(optics).
- Bahtinov_mask wikiPageWikiLink Carey_mask.
- Bahtinov_mask wikiPageWikiLink Category:Optics.
- Bahtinov_mask wikiPageWikiLink Category:Telescopes.
- Bahtinov_mask wikiPageWikiLink Diffraction.
- Bahtinov_mask wikiPageWikiLink Hartmann_mask.
- Bahtinov_mask wikiPageWikiLink Objective_(optics).
- Bahtinov_mask wikiPageWikiLink Pavel_Bahtinov.
- Bahtinov_mask wikiPageWikiLink Star.
- Bahtinov_mask wikiPageWikiLink Telescope.
- Bahtinov_mask wikiPageWikiLink File:Bahtinov_mask.jpg.
- Bahtinov_mask wikiPageWikiLink File:Bahtinov_mask_principle.svg.
- Bahtinov_mask wikiPageWikiLinkText "Bahtinov mask".
- Bahtinov_mask wikiPageUsesTemplate Template:Astronomy-stub.
- Bahtinov_mask wikiPageUsesTemplate Template:Optics-stub.
- Bahtinov_mask wikiPageUsesTemplate Template:Reflist.
- Bahtinov_mask subject Category:Optics.
- Bahtinov_mask subject Category:Telescopes.
- Bahtinov_mask hypernym Device.
- Bahtinov_mask type Device.
- Bahtinov_mask type Science.
- Bahtinov_mask comment "The Bahtinov mask is a device used to focus small astronomical telescopes accurately.It was invented by Russian amateur astrophotographer Pavel Bahtinov in 2005 (http://www.astronomy.ru/forum/index.php/topic,10421.0.html). Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.The telescope is pointed at a bright star, and a mask is placed in front of the telescope's objective (e.g.".
- Bahtinov_mask label "Bahtinov mask".
- Bahtinov_mask sameAs Q803671.
- Bahtinov_mask sameAs Bahtinov-Maske.
- Bahtinov_mask sameAs Masque_de_Bahtinov.
- Bahtinov_mask sameAs Máscara_de_Bahtinov.
- Bahtinov_mask sameAs m.06zjslr.
- Bahtinov_mask sameAs Маска_Бахтинова.
- Bahtinov_mask sameAs Q803671.
- Bahtinov_mask wasDerivedFrom Bahtinov_mask?oldid=677133940.
- Bahtinov_mask depiction Bahtinov_mask.jpg.
- Bahtinov_mask isPrimaryTopicOf Bahtinov_mask.