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physical object > artifact > device > instrument > optical device > focus > prime focus |
prime focus | ||||
subject | fact |
prime focus | has definition The focal point of the large primary reflecting mirror in astronomical telescopes when the light source is extremely distant. This focus actually falls at a point just within the upper structure of the telescope itself and is therefore accessible to CCD cameras and other instruments; it provides a large field of view. | |
is a kind of focus | ||
instrument | has operator | |
artifact | has creator | |
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physical object | has location or center of gravity | |
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