Dall–Kirkham telescope design
E99267
The Dall–Kirkham telescope design is a type of reflecting telescope that uses an elliptical primary mirror and a spherical secondary mirror to provide good on-axis image quality with relatively simple, easy-to-manufacture optics.
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
reflecting telescope design
→
telescope optical design → |
| canBeModifiedTo |
corrected Dall–Kirkham design with additional lenses
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|
| hasAberrationCharacteristics |
coma increases off-axis
→
spherical aberration corrected on-axis → |
| hasAdvantageOver |
Ritchey–Chrétien telescope design in manufacturing simplicity
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|
| hasDesignGoal |
reduce manufacturing cost
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simplify mirror figuring → |
| hasDisadvantageComparedTo |
Ritchey–Chrétien telescope design in wide-field performance
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|
| hasFieldOfView |
narrow corrected field
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|
| hasFocalRatioRange |
typically long focal ratios
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|
| hasHistoricalUse |
early Cassegrain-type amateur telescopes
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|
| hasNameOrigin |
named after Horace Dall and Allan Kirkham
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|
| hasOffAxisPerformance |
relatively poor off-axis image quality compared to some other designs
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|
| hasOpticalConfiguration |
two-mirror Cassegrain-type system
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|
| isCharacterizedBy |
non-spherical primary mirror figuring only
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simple spherical secondary alignment → |
| isComparedTo |
Ritchey–Chrétien telescope design
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|
| isKnownFor |
ease of manufacture of optical components
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relatively simple optics → |
| isOptimizedFor |
on-axis and small-field observations
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|
| isUsedFor |
high-resolution imaging near the optical axis
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planetary observation → |
| isUsedIn |
amateur astronomical telescopes
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small professional telescopes → |
| providesImageQuality |
good on-axis image quality
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|
| usesPrimaryMirrorShape |
elliptical primary mirror
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|
| usesPrimaryMirrorType |
concave elliptical primary mirror
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|
| usesSecondaryMirrorShape |
spherical secondary mirror
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|
| usesSecondaryMirrorType |
convex spherical secondary mirror
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|
Referenced by (1)
| Subject (surface form when different) | Predicate |
|---|---|
|
Cassegrain focus
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|
componentOf |