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gptkbp:instanceOf
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astronomer
|
|
gptkbp:alignment
|
Rarely needed
|
|
gptkbp:alsoKnownAs
|
Refractor
|
|
gptkbp:canBe
|
gptkb:Binocular
gptkb:Monocular
|
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gptkbp:compatibleWith
|
Mirrors
|
|
gptkbp:component
|
Eyepiece
Objective lens
|
|
gptkbp:corrects
|
Achromatic lens
Apochromatic lens
|
|
gptkbp:fieldOfView
|
Narrow
|
|
gptkbp:firstInvented
|
Early 17th century
|
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gptkbp:firstUsedFor
|
Astronomical observation
Military observation
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gptkbp:focalLengthDeterminedBy
|
Objective lens
|
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gptkbp:historicalSignificance
|
First type of telescope
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Refracting telescope
|
|
gptkbp:imageFormedBy
|
Refraction
|
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gptkbp:imageOrientation
|
Inverted
|
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gptkbp:inventedBy
|
gptkb:Hans_Lippershey
gptkb:Jacob_Metius
gptkb:Sacharias_Jansen
|
|
gptkbp:limitation
|
Chromatic aberration
Cost of large lenses
Lens sagging
|
|
gptkbp:maintenance
|
Low
|
|
gptkbp:maximumPracticalAperture
|
About 1 meter
|
|
gptkbp:notableExample
|
gptkb:Lick_Observatory_refractor
gptkb:Yerkes_Observatory_refractor
|
|
gptkbp:notableUser
|
gptkb:Galileo_Galilei
gptkb:Johannes_Kepler
|
|
gptkbp:objectiveLensMaterial
|
gptkb:Crown_glass
gptkb:Flint_glass
|
|
gptkbp:popularFor
|
17th century
|
|
gptkbp:replacedBy
|
Reflecting telescope
|
|
gptkbp:requires
|
gptkb:mountain
Tube
|
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gptkbp:suffersFrom
|
Chromatic aberration
|
|
gptkbp:telescopeType
|
gptkb:Huygens_eyepiece
gptkb:Ramsden_eyepiece
gptkb:Kellner_eyepiece
gptkb:Plössl_eyepiece
|
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gptkbp:type
|
gptkb:Dobsonian_mount
gptkb:Altazimuth_mount
Equatorial mount
|
|
gptkbp:usedFor
|
Astronomy
Terrestrial observation
|
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gptkbp:usedIn
|
gptkb:Amateur_astronomy
Educational purposes
|
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gptkbp:uses
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gptkb:Lenses
|
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gptkbp:bfsParent
|
gptkb:Capodimonte_Astronomical_Observatory
|
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gptkbp:bfsLayer
|
6
|