The Sinclair Tropical Una is a British-made wood-and-brass field camera produced by James A. Sinclair of London for use in hot, humid climates. The Tropical variant used teak with brown leather bellows in place of the standard mahogany construction, and was aimed at professional and serious amateur plate photographers in the early twentieth century.

Sales data is thin: a single hammer result of £1,400 at UK auction in 2020 is the only recent reference point, so a meaningful range or median cannot be established for what a Sinclair Tropical Una is worth in 2026. Tropical-bodied British field cameras are condition-sensitive at saleroom level, and the price a clean example sells for today depends heavily on bellows integrity, completeness of dark slides, and the presence of an original lens.