Rapid Rectilinear

The Rapid Rectilinear also named Aplanat is a famous photographic lens design.

The Rapid Rectilinear is a lens that is symmetrical about its aperture stop with four elements in two groups. It was introduced by John Henry Dallmeyer in 1866. The symmetry of the design greatly reduces radial distortion.

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Famous quotes containing the word rapid:

    “It now appears that the negro race is, more than any other, susceptible of rapid civilization. The emancipation is observed, in the islands, to have wrought for the negro a benefit as sudden as when a thermometer is brought out of the shade into the sun. It has given him eyes and ears.”
    —Ralph Waldo Emerson (1803–1882)