|
gptkbp:instanceOf
|
astronomer
|
|
gptkbp:advantage
|
eliminates chromatic aberration
|
|
gptkbp:alternativeTo
|
astronomer
|
|
gptkbp:commonIn
|
amateur astronomy
|
|
gptkbp:commonMountType
|
gptkb:Dobsonian_mount
gptkb:alt-azimuth_mount
equatorial mount
|
|
gptkbp:component
|
eye
primary mirror
secondary mirror
focuser
optical tube assembly
spider (mirror support)
|
|
gptkbp:establishedIn
|
1668
|
|
gptkbp:eyepiecePosition
|
side of the telescope tube
|
|
gptkbp:fieldOfView
|
wide
|
|
gptkbp:focalRatioRange
|
f/4 to f/8
|
|
gptkbp:historicalSignificance
|
first successful reflecting telescope
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Newtonian telescope
|
|
gptkbp:influenced
|
gptkb:Dobsonian_telescope
modern amateur telescopes
|
|
gptkbp:introducedIn
|
1668
|
|
gptkbp:inventedBy
|
gptkb:Isaac_Newton
|
|
gptkbp:lightPath
|
reflected 90 degrees to the side
|
|
gptkbp:limitation
|
coma aberration at wide fields
diffraction spikes from spider vanes
open tube design susceptible to dust
|
|
gptkbp:maintenance
|
requires collimation
|
|
gptkbp:mirrorAlignment
|
collimation required
|
|
gptkbp:mirrorCoating
|
aluminum
|
|
gptkbp:mirrorMaterial
|
gptkb:glass
|
|
gptkbp:namedAfter
|
gptkb:Isaac_Newton
|
|
gptkbp:notableExample
|
gptkb:Isaac_Newton's_original_telescope_(Royal_Society,_London)
|
|
gptkbp:opticalDesign
|
reflector
|
|
gptkbp:popularApertureRange
|
4 to 16 inches
|
|
gptkbp:primaryMirrorDiameter
|
parabolic
parabolic mirror
|
|
gptkbp:purpose
|
astronomer
|
|
gptkbp:secondaryMirrorShape
|
flat
|
|
gptkbp:tubeMaterial
|
gptkb:plastic
metal
carbon fiber
|
|
gptkbp:usedFor
|
astrophotography (with modifications)
deep sky observation
lunar observation
planetary observation
|
|
gptkbp:usedIn
|
observatories
backyard astronomy
|
|
gptkbp:usesSecondaryMirror
|
flat diagonal mirror
|
|
gptkbp:bfsParent
|
gptkb:astronomer
|
|
gptkbp:bfsLayer
|
4
|