Exakta Patent Duplex 710

Produced by Exakta from 1914 to 1939, the Patent Duplex 710 is a significant early 35mm camera utilizing the 135 format. Its lengthy production run indicates commercial success and market relevance during a transitional period in photography. The name "Duplex" likely refers to a key feature, possibly a dual film path system or double-exposure capability, designed to simplify handling or expand functionality for the emerging smaller format. As one of the early adopters of 135 film, the 710 contributed to the popularization of compact, high-quality photography before the format became universally standardized, serving both amateur and professional users seeking portability without sacrificing image quality relative to larger formats of the era.

The camera's construction prioritized durability and precision for its time, featuring a robust metal body and precision mechanics typical of Exakta's engineering focus. While lacking the iconic status of later 35mm legends, the Patent Duplex 710 holds a place in history as a practical and enduring workhorse that bridged gap between plate/folder cameras and the modern miniature SLR era. Its long production cycle speaks to a well-designed, reliable camera that met the needs of photographers during the first quarter of the 20th century, solidifying the viability of 35mm photography.