The Ernemann Heag IV 9x18 Series II is an early 20th-century folding plate camera produced by the German manufacturer Ernemann of Dresden, taking 9x18 cm stereo plates. It was positioned as a stereoscopic camera within Ernemann's Heag IV folding range during the pre-1926 era, before the firm was absorbed into Zeiss Ikon.

At UK auction in 2026, a Heag IV 9x18 Series II hammered at £110, which gives the only documented saleroom data point for what this model is currently worth. With just one recorded hammer price, the figure should be treated as indicative rather than a reliable market median, and today the value of any given example will swing sharply on condition of the bellows, shutter and original plate holders.