The Merkel Metharis Tropen (Tropical) is a folding plate camera produced by the German maker Merkel, built in a tropical specification intended for use in hot and humid conditions. It belongs to the early-twentieth-century class of wood-and-metal folding plate cameras and is encountered today as a collector's item rather than a working tool.

Auction evidence for this model is thin: a single UK saleroom hammer result from November 2004 records a price of £521, which is the only data point available to gauge what a Merkel Metharis Tropen is worth. With just one verified sale, there is no meaningful range or median to publish for today's market, and any current value estimate would be speculative; condition of the bellows, woodwork and brass fittings would heavily influence what a comparable example sells for if one surfaced again.