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- Bahtinov_mask abstract "The Bahtinov mask is a device used to accurately focus astronomical telescopes.It is named after its inventor Pavel Bahtinov. Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.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 (star). 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 on the star and symmetrically positioned between the other two spikes. Small deviations from optimal focus are easily visible.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. The direction of this displacement provides information on which way focus needs to be made. The operator will place the mask over the front aperture of the telescope in the same orientation each time. He/she will then become familiar with the direction clue provided by the central spike. Rotating the mask through 180 degrees will reverse the direction of spike movement, hence the need to place the mask on the scope with consistent orientation. Very bright star and very dark sky is required for focusing. Otherwise the spikes are not very well visible or not visible at all.The mask must be removed after accurate focusing is achieved.".
- 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 wikiPageRevisionID "578759419".
- Bahtinov_mask hasPhotoCollection Bahtinov_mask.
- Bahtinov_mask subject Category:Optics.
- Bahtinov_mask subject Category:Telescopes.
- Bahtinov_mask type Artifact100021939.
- Bahtinov_mask type Device103183080.
- Bahtinov_mask type Instrument103574816.
- Bahtinov_mask type Instrumentality103575240.
- Bahtinov_mask type Magnifier103709206.
- Bahtinov_mask type Object100002684.
- Bahtinov_mask type PhysicalEntity100001930.
- Bahtinov_mask type ScientificInstrument104147495.
- Bahtinov_mask type Telescope104403638.
- Bahtinov_mask type Telescopes.
- Bahtinov_mask type Whole100003553.
- Bahtinov_mask comment "The Bahtinov mask is a device used to accurately focus astronomical telescopes.It is named after its inventor Pavel Bahtinov. Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.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 (star).".
- Bahtinov_mask label "Bahtinov mask".
- Bahtinov_mask label "Bahtinov-Maske".
- Bahtinov_mask label "Masque de Bahtinov".
- Bahtinov_mask label "Máscara de Bahtinov".
- Bahtinov_mask label "Маска Бахтинова".
- 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 Q803671.
- Bahtinov_mask sameAs Q803671.
- Bahtinov_mask sameAs Bahtinov_mask.
- Bahtinov_mask wasDerivedFrom Bahtinov_mask?oldid=578759419.
- Bahtinov_mask depiction Bahtinov_mask.jpg.
- Bahtinov_mask isPrimaryTopicOf Bahtinov_mask.
