In addition to Nikon's own range of " Nikkor" lenses, brands of F-mount photographic lenses include Zeiss, Voigtländer, Schneider, Angénieux, Samyang, Sigma, Tokina, Tamron, Hartblei, Kiev-Arsenal, Lensbaby, and Vivitar. The F-mount has been in production for over five decades, making it the only SLR lens mount which has been produced for over 50 years. The F-mount is also popular in scientific and industrial applications, most notably machine vision. Over 400 different Nikkor lenses are compatible with the system (other details can be found at the Nikkor The Thousand and One Nights site ). The large variety of F-mount compatible lenses makes it the largest system of interchangeable flange-mount photographic lenses in history. The Nikon F-mount is one of only two SLR lens mounts (the other being the Pentax K-mount) which were not abandoned by their associated manufacturer upon the introduction of autofocus, but rather extended to meet new requirements related to metering, autofocus, and aperture control.
6.3.3 Lenses with integrated autofocus motors.
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