Imaging recource: A quiet shift in AF: LensRentals investigates the linear autofocus trend

Roger Cicala, Aaron Closz, and Erick Marquez of LensRentals have put together an in-depth look at electromagnetic focusing, discussing how it's used in modern lenses, what some of its weaknesses might be, and what it might allow lens designers to do in the future. Autofocus systems come in a variety of forms, including early geared direct current motors, ring ultrasonic motors, and more. Recently, though, several manufacturers have started employing voice-coil actuators to move focusing elements inside lenses. These VCA lenses are notable in that they moved...
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