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There are at least three kinds of pre-MC lenses: those with no particular aperture functionality (plain Rokkor), those with manual pre-set aperture (also plain Rokkor, mostly Tele Rokkors), and those with automatic pre-set aperture (Auto Rokkor). | |||
 | These lenses are very early designs and do not incorporate meter coupling. Accordingly they are normally only of interest to collectors, with the exception of some specific lenses such as the 18mm UW-Rokkor f/9.5, the 100mm Auto Tele Rokkor f/2 or super-telephoto lenses and catadioptric lenses such as the old, big, rare, and unusually fast (given the focal length) RF Rokkor 1,000 mm f/6.3. Naturally, with a mirror lens such as the 1,000mm f/6.3 the absence of meter coupling and automatic diaphragm is of no concern, as the lens does not contain a diaphragm to be stopped down. |
