Astronomical survey
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An astronomical survey is a general map or image of a region of the sky that lacks a specific observational target. Alternatively, an astronomical survey may comprise a set of images, spectra, or other observations of objects that share a common type or feature. Surveys are often restricted to one band of the electromagnetic spectrum due to instrumental limitations, although multiwavelength surveys can be made by using multiple detectors, each sensitive to a different bandwidth.
Composite image of the GOODS-South field, result of a deep survey using two of the four giant 8.2-metre telescopes composing ESO's Very Large Telescope
Gamma-ray pulsars detected by the Fermi Gamma-ray Space Telescope
Spectrum of types of observations of Solar System objects.
The positions in space of just some of the galaxies identified by the VIPERS survey (see Visible Multi Object Spectrograph).
Astrograph
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An astrograph is a telescope designed for the sole purpose of astrophotography. Astrographs are mostly used in wide-field astronomical surveys of the sky and for detection of objects such as asteroids, meteors, and comets.
A 13-inch (330 mm), f/5.3 astrograph at Lowell Observatory (a refractor with a 3 element Cooke triplet lens) used in the discovery of Pluto.
A double astrograph consisting of two 6-inch (150 mm) astrographs and a central guide scope on display at Landessternwarte Heidelberg-Königstuhl observatory.
The Bruce double astrograph at the Landessternwarte Heidelberg-Königstuhl observatory.
This is a modern amateur Newtonian astrograph, specifically designed for astrophotography.