Ross is the name of a succession of London-based lens designers and their company. Andrew Ross (1798–1859) founded his company in 1830, from 1840 producing camera lenses signed "A. Ross". Particularly during Andrew Ross's lifetime, the company was one of the foremost lens companies. In the twentieth century, Ross continued to produce lenses, but also produced binoculars, epidiascopes, etc. After World War II Ross produced lenses for Ensign, MPP, and other cameras. Ross was taken over by Avimo in 1975; Avimo was later taken over by Thales Optics.
Source
Wilkinson, Matthew, and Colin Glanfield. A lens collector's vade mecum. (CD publication) "Version 7/5/2001" (7 May 2001).
