Definition: (1) ~ image: one that shows the subject upside down when projected or seen. * Also an image whose tonalities and colours are reversed. (2) ~ telephoto: design of lens with strongly negative groups in front and positive groups behind for short-focal lengths such that the distance from the rear vertex to focal plane is greater than the focal length. * Also known as reversed telephoto, retro-focus. (3) ~ selection: process in image or graphics manipulation by which all the objects not at first selected become selected, thus reversing or inverting the original selection. (4) ~ microscope: made to look at under-side of objects which cannot be turned over e.g. Petri dishes, so the objective points vertically upwards.
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