Page "Single-lens reflex camera" Paragraph 39
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Large format SLR cameras were probably first marketed with the introduction of C. R.
Smith's Monocular Duplex ( USA, 1884 ).
SLRs for smaller exposure formats were launched in the 1920s by several camera makers.
The first 35 mm SLR available to the mass market, Leica's PLOOT reflex housing along with a 200mm f4. 5 lens paired to a 35mm rangefinder camera body, debuted in 1935.
The Soviet Спорт (“ Sport ”), also a 24mm by 36mm image size, was prototyped in 1934 and went to market in 1937.
K. Nüchterlein's Kine Exakta ( Germany, 1936 ) was the first integrated 35mm SLR to enter the market.
Additional Exakta models, all with waist-level finders, were produced up to and during World War II.
Another ancestor of the modern SLR camera was the Swiss-made Alpa, which was innovative, | archivedate = 2007-11-14
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