| | | Here's a really neat disassembly of a Canon EF 28-105 USM, USM being Ultra Sonic Motor focusing, a no-gearing way of turning the lens elements in a camera lens. I like the focus key curve which adjusts the elements according to how far you want to (...) (19 years ago, 24-Oct-05, to lugnet.org.ca.rtltoronto)
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