Twin-lens reflexes and precision 35mm SLRs emerged as serious tools for professional and art photography.
The twin-lens reflex design was established by the Rolleiflex, offering waist-level viewing and quiet operation for street and studio work.
The Kine Exakta of 1936 introduced the 35mm single-lens reflex concept, and the Zeiss Ikon Contax II featured the first combined rangefinder/viewfinder.
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