![]() Several contrast measurements at various focusing positions must be made before the correct direction of motion for focusing can be determined and followed by precise focusing. In addition to space limitations, the choice of the drive motors is also determined by the AF principle used for focusing. ![]() This system, comprising two particularly light focusing lenses, allows the construction of particularly small and compact drive systems. ![]() Specialists from the areas of optical and mechanical engineering and electronics worked together in an interdisciplinary team on the development of a unique lens concept based on double internal focusing. In order to preserve the compact dimensions of the lenses, the integration of these components must follow an integral approach. These are limited only by the mass of the lens elements moved when focusing, the travel from infinity to the closest focusing distance and, of course, the amount of space available. They thank their outstanding AF performance figures to the autofocus drive unit they share. The AF system of the Summicron-SL lenses is fast, precise, and almost silent.
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