Antti-Pekka Virjonen wrote:
For wide-angle to short telephoto lens, your point is right. But for long telephoto lens, especially those without internal focusing, USM is much faster. Another major advantage for USM is that it is very silent, which is important for wildlife or concert photography.
On the other hand I think there is no need to implement USM at all. The shaft/pin
drive methods works about as fast and good as the USM competition and it allows
the lenses to be cheaper without the motor.
Regards,
Henry Chu
14/2/2003
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