P� 22. okt. 2004 kl. 21.13 skrev P�l Jensen:
You're right!
I should know :-)
I haven't time to check all the patents (again) but these are some Pentax IS patents:
US patent No: 5,039,211 (Zoom lens capable of image blur compensation); 5,583,597 (Blur correcting apparatus and method for camera); 4,996,545 Apparatus for correcting blurred image of camera using angular acceleration sensor and angular acceleration sensor) etc.
From what I see from a quick look at the claims neither of these are general enough to give an absolute control over anti vibration, so you can�t conclude that Nikon or Canon uses them. They do, however, show that Pentax has been preparing for the implementation of anti vibration. Several things may have happened later. Somebody else may control the wider and earlier patents, or Pentax�solution may simply not work. We don�t known, but the patents should give us some hope.
I�ll try to find some time to do some more advanced searches.
DagT
