Your description needs correcting. The 50mm 1.4 USM lens has an ultrasonic micro motor which uses a gear assembly to drive the focus mechanism, as opposed to a ring-type USM focus that does not use gears. The micro motor USM system does not allow for full-time manual focus, and requires switching from auto focus to manual focus or damage to the gears will result. And it is also not as quiet as the ring-type USM models.
Thu, 17 May 2012 02:22:00 +0400
Thanks for pointing that out. I thought I had manual focused while in AF mode before and it felt as smooth as ring-type USM. I will try it tonight on my lens and see what happens.
Thu, 17 May 2012 02:47:37 +0400
Did your message disappear? Read the Forums FAQ.
Spam Control | * indicates required field
TrackBack only accepted from WebSite-X Suite web sites. Do not submit TrackBacks from other sites.
No TrackBacks yet. TrackBack can be used to link this thread to your weblog, or link your weblog to this thread. In addition, TrackBack can be used as a form of remote commenting. Rather than posting the comment directly on this thread, you can posts it on your own weblog. Then have your weblog sends a TrackBack ping to the TrackBack URL, so that your post would show up here.
Messages, files, and images copyright by respective owners.