The Lancaster International Patent is a wood-and-brass field camera produced in Britain in the late 19th century, when Lancaster of Birmingham supplied a range of folding plate cameras for amateur and travelling photographers. As a field camera it was designed to be folded flat for transport and used on a tripod with glass plates.

Sales data for the Lancaster International Patent field camera is extremely thin: the only recorded UK auction hammer result on file is a single Christie's sale at £149 in 1998, so there is no current price band to quote for today's market. With just one historic data point at saleroom level, what the camera is worth now depends heavily on condition, completeness of the brass fittings and bellows, and whether a period lens is included.