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Looking down the tube

Looking into the tube of this telescope from the top end, the electronic Charge-Coupled-Device (CCD) camera (black cylinder) is mounted at the "prime focus" at the top end, pointed down toward the mirror at the bottom of the tube. The large 32" mirror gathers incoming light and focusses the image directly onto the CCD chip within the camera. The chip, a mosaic of electronic light sensors, tells the computer how the image varies in terms of light and dark areas, thus enabling an equivalent pixelized image to be displayed on a computer monitor in the control room or anywhere else from where the digitized image is accessible.