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 he began producing camera lenses signed "A. Ross". During Andrew Ross's lifetime, the company was one of the foremost lens manufacturers. After Andrew's death in 1859 his son-in-law John Henry Dallmeyer left the firm to establish his own optical company in 1860 and the company was run by Ross's son, Thomas, and became known as Ross & Co. By the 1890s was also making Zeiss and Goerz lenses under licence for sale in the UK and the British Empire. Ross patented a Wide Angle lens design and Zeiss took this further to produce their EWA Protars, before World War 1 Ross and Zeiss worked quite closely together, but at the outbreak of War the British Government put Ross in control of the newly opened Carl Zeiss binocular and optical factory in Mill Hill, London.

ROSS LONDON 

We Design and Manufacture Motion Picture Lenses using our patented Wireform™ lens drive technology, offering variable-pitch close focus movements. Our Well-equipped Service Centre and highly skilled engineers offer optical support for maintenance and repair as well as bespoke engineering.

ROSS LONDON XPRES (VAN DIEMEN REHOUSING) series lenses

ROSS LONDON XPRES (VAN DIEMEN REHOUSING)