Sorry P�l, this must be crap. USM selling point is less couplings,
less friction than traditional gear mechanisms. If theirs lasts 20
hours, than how many minutes should survive ours? :o/
Servus, Alin
P�l wrote:
PJ> According to Canon the ultrasonic motors used in their lenses have
PJ> a lifespan of less than 20 hours due to friction wear and tear.
PJ> This according to Nikkei Industrial daily. (I read it on photo.net)
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