Major SLR and RF innovations of the 20th century

YearProductWorld's firstMount
1932Leica II and Contax I35mm rangefinder cameras.M39 (Leica II)
Dual bayonet (Contax I)
1936Kine Exakta35mm SLR camera.Exakta
1941Kodak EktarLine of single-coated lenses.Proprietary
1948Rectaflex A.100035mm SLR camera with pentaprism used in the viewfinder.Proprietary
1948Duflex35mm SLR camera with external automatic aperture stop-down and instant-return mirror.Proprietary
1949Contax S and Praktica35mm SLR cameras with M42 screw mount.
Contax S was also the first German 35mm SLR camera with pentaprism used in the viewfinder.
M42
1950Exakta Varex35mm SLR camera with interchangeable viewfinder and interchangeable focusing screens.Exakta
1950P. Angenieux 35mm F/2.5 R1Retrofocus wide-angle lens.Popular MF mounts
1953Contax E35mm SLR camera with built-in light meter.M42
1955Kilfitt Makro-Kilar 4cm f/3.5Macro lens to provide continuous focusing from infinity to 1:2 (model E) or 1:1 (model D).Popular MF mounts
1956Contax F and Praktica FX 235mm SLR cameras with internal automatic aperture stop-down but without instant-return mirror.M42
1956Chiyoko RokkorLine of multi-coated lenses.M39
1958Zunow35mm SLR camera with internal automatic aperture stop-down and instant-return mirror.Proprietary
1959Voigtlander-Zoomar 36-82mm F/2.8Zoom lens.Popular MF mounts
1961PC-Nikkor 35mm F/3.5Perspective control lens.Nikon F
1962Fisheye-Nikkor 8mm F/8Fisheye lens.Nikon F
1962Fish-eye-Takumar 18mm F/11Full-frame (diagonal) fisheye lens.M42
1963Topcon RE Super35mm SLR camera with through-the-lens (TTL) metering system.Topcon
1966Praktica PL electronic35mm SLR camera with an electronically controlled shutter.M42
1966Leitz Wetzlar Noctilux 50mm F/1.2Lens for 35mm rangefinder cameras to feature an aspherical element.Leica M
1967Nikkor-N 24mm F/2.8Lens to feature a floating element system.Nikon F
1968OP-Fisheye-Nikkor 10mm F/5.6 OPLens for 35mm SLR cameras to feature an aspherical element.Nikon F
1969Canon FL-F 300mm F/5.6Lens for visible light photography to employ synthetic fluorite.Canon FL
1969Praktica LLC35mm SLR camera with electric contact lens mount and electromechanical aperture stop-down.Modified M42
1971Asahi Pentax Electro Spotmatic35mm SLR camera with electronic aperture-priority TTL (stop-down) automatic exposure metering and electronically controlled shutter.M42
1971Canon FD 55mm F/1.2 ALLens for 35mm SLR cameras for use without a mirror-lock mechanism to feature an aspherical element.Canon FD
1975Leitz Canada APO-Telyt-R 180mm F/3.4Apochromatic lens.Leica R
1981Sigma 21-35mm F/3.5-4Ultra-wide angle zoom lens.Popular MF mounts
1985Kino Precision Kiron 28-210mm F/4-5.6 MC MacroSuperzoom lens.Popular MF mounts
1985Minolta ALine of interchangeable AF lenses.Minolta A
1987Canon EFFully-electronic mount for 35mm SLR cameras.Canon EF
1987Canon EF 300mm F/2.8L USMInterchangeable lens with built-in ultrasonic motor.Canon EF
1995Canon EF 75-300mm F/4-5.6 IS USMInterchangeable lens with built-in image stabilization.Canon EF
1999Nikon D1Digital SLR camera developed by a major camera manufacturer.Nikon F
2002Contax N Digital35mm full frame digital SLR camera.Contax N

NOTE: only serially-produced consumer photographic products for 35mm cameras with interchangeable lenses are listed.

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