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I do wonder if the demand (whose?) for ever faster AF hasn't added to the issue. The faster you run AF motors and the shorter the the turn required to focus the more issues like backlash and overrun are going to be proportionally exaggerated unless they are well controlled.
Good point, that together with ever increasing pixel count and the ease (with Digital) of viewing the image at extreme magnification (who would have enlarged a 35mm negative to 30x24" just to see if it was sharp at a viewing distance of 6" if they were only intending to display a 10x8" print to view at 3') has made us increasingly demanding.
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