The Sinclair Una was introduced in 1904 and was a development of the Dallmeyer Correspondent. It had additional features including an extra rising front achieved by the hinged section on the top of the camera. The BJPA heralded the camera's arrival: 'A folding camera, complete in itself but fitted for every class of photography of the most serious kind, is but a bald description of the Una, devised and placed on the market by Mr. James A. Sinclair's firm. There are but few cameras with the same range of movements, and still fewer manufactured with the same thorough workmanship'. A Una de Luxe camera was also offered which had triple extension and extra movements of the front standard. The BJPA concluded it's review: 'No description in print, we are afraid, can give a proper idea of its working qualities, but we can honestly say that no better instrument can be placed in the hands of the photographer who may wish to take it to any part of the world and to be able to place absolute reliance upon its behaviour'.

The combination of the Una camera mounted on an Atkins-Swan support was chosen by the Royal Geographical Society for one the first Everest expeditions.

The Una seems to have been eclipsed by the Alpha hand camera for a period during the 1920s and 1930s disappeared from advertising before the first world war. It had reappeared, in the late 1930s (although it probably never really went away) and a 1940 advertisement described six plate sizes of Una from 3½ x 2½ to 7 x 5 inches as being available plus tropical model.

The Atkin Swan (Folding) Tilting Table was designed for telephoto work 'the idea is entirely founded upon practical requirements, and considering Dr Atkin Swan is such a successful worker, and whose work is so well known, the Apparatus can be offered with every confidence'.