Exakta Auto-Ultrix (2860, Double-format)

Introduced in 1931, the Exakta Auto-Ultrix (model 2860) represents a significant step in the evolution of the 35mm SLR camera. As one of the earliest attempts by Exakta to market a 35mm single-lens reflex design, it shared the era's compact, angular body construction characteristic of roll-film cameras adapted for 35mm cassettes. Its most notable feature was the "Double-format" designation, likely indicating an innovative capability to handle different film formats, possibly through interchangeable backs or a dual-frame counter, addressing the practical limitations of early 35mm film loading and usage. This positioned the Auto-Ultrix as a technologically advanced, albeit somewhat experimental, offering for serious amateur photographers venturing beyond roll film into the burgeoning smaller format space. It served as a crucial prototype and testing ground for the more refined and commercially successful Kine Exakta that followed in 1936, cementing Exakta's reputation as an early pioneer in 35mm SLR development.