| http://www.w3.org/ns/prov#value | - You should know that those lenses are not mechanically connected to the focusing ring ??? there is a ultrasonic motor between the focusing ring and the lens groups ??? ergo lenses are moved around by magnetic forces -not simply by good old friction or gears??? therefore if you take the time to focus on a spot on a EF lens (to mark a spot) ??? it will not be able to hit that spot consistently over
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