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prime focus
subjectfact 
prime focushas 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.has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:27:40.0
is a kind of focus2001-09-27 09:27:40.0
instrumenthas operator2001-09-27 09:27:28.0
artifacthas creator2001-09-27 09:27:27.0
has creation date2001-09-27 09:27:27.0
has purpose2001-09-27 09:27:27.0
has owner2001-09-27 09:27:27.0
physical objecthas location or center of gravity2001-09-27 09:27:27.0
has angular momentum2001-09-27 09:27:27.0
has mass2001-09-27 09:27:27.0
has velocity2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0
has material2001-09-27 09:27:27.0

Next focuscoudé focus    Upfocus