Archive for January, 2016
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Theoretically, the 50mm has been unchanged since 1993, but the electronics look just barely possible in 1993. The traces & vias are 1980's grade. 0603 is the smallest component, showing a very old design. -
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The autofocus mechanism is quite an investment, explaining why Nikon tried putting it in the camera body instead of replicating it in each lens. -
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A very tiny optical encoder provides feedback for the autofocus. -
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The ultrasonic motor is quite a beast. It has no labels, brushes or openings. It has some kind of keyed coupling to the gear. The motor is very difficult to turn, but slips during part of every revolution. The line impedances go from 300k to 500k.