The Negretti & Zambra Sliding Box Camera is a 19th-century wooden plate camera using the sliding-box focusing system, in which the rear section slides within an outer box to bring the image to focus on a ground-glass screen. Negretti & Zambra was a London optical and scientific instrument maker, and cameras under their name belong to the early wet-plate and daguerreotype era of British photography.

Sales data for this model is extremely thin: only a single UK auction hammer result is recorded, at £4,560 in 2017. With one data point, there is no meaningful range or median to quote, and the price a comparable example would sell for today depends heavily on completeness, condition of the woodwork and brass fittings, and whether an original lens is present. Buyers researching what one of these is worth at saleroom level should treat the figure as indicative only.