Rapid Rectilinear
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Rapid rectilinear - lens system composed of two matching doublet lenses, symmetrically placed around the focal aperture. It was introduced by Dallmeyer and Sternheil and removed many of the aberrations present in more simple constructions.
A still earlier Wollensak product was the Verito. Except for the two smallest sizes, this was an f4 lens, the back group of which could be used by itself. It may have been a Rapid Rectilinear type, but more likely a Petzval. ...
 See also: Lens, Camera, Diaphragm, Doublet, Lenses
  
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