Renowned lens reviewer Christopher Frost has posted a review of Canon’s first autofocus lens, the Canon FD 35-70mm f/4 AF.
About the Canon FD 35-70mm f/4 AF
This is the world’s first autofocus zoom lens with an autofocus function using Canon’s own SST (Solid State Triangulation) method. The incorporation of this function into the best-selling FD35-70mm f/4 (June 1979) interchangeable lens brought about automation of focusing for SLR cameras.
The SST method is a system in which information on the photographed object that enters the sensor through two fixed mirrors is converted into an electric signal and distance is measured by a microcomputer, with focusing performed by moving a distance ring with a motor. The latest fixed imaging device CCD (charge-coupled device) technology is adopted to provide high resolution and a broad dynamic range able to detect low to high luminance, making it less susceptible to the contrast and pattern size of the photographed object and enabling highly...
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