Positive lens - simple lens that causes light rays from a subject to converge to a point.
Positive/positive printing - process for printing a color transparency directly on paper to produce a positive print.
Telecompression Reduction of the effective focal ratio of an optical system via the introduction of a positive lens system into the optical path between the basic optical elements and the focal plane.
A type of lens design with a negative lens element positioned in front of the diaphragm and a positive lens element positioned at the rear of the diaphragm.
compensated zoom lens, the afocal system consists of two positive (converging) lenses of equal focal length (lenses L1 and L3) with a negative (diverging) lens (L2) between them, with an absolute focal length less than half that of the positive ...
For cameras, the diopter is used as the measure of the dioptric power for the image in the viewfinder. Dioptric Power Apparent image distance through optics such as viewfinders. Rated in diopters. A plus sign is used for positive lenses, ...
 See also: Element, Lens, Focal length, Camera, Negative
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