Originally posted by falconeye In the case of the Pentax SR system (the one I studied) it is gyro sensors, not accelerometers. The gyro sensors (there are two in the K20D) work by measuring the corilios force and are pretty ingenious pieces of electonics
In some of my earlier posts, I gave the exact manufacturer and part number.
interesting, I would have assumed accelerometers since they would also allow for the implementation of the level and auto rotation of images when you tip the camera on the K7. otherwise there is an additional 3D accelerometer for this because level is static and a gyro would not be able to measure it.
Quote: Wrong. This is the nice part about sensor-based stabilization. You only need to know the angular frequency around the optical axis and the two axis perpendicular to it and the focal length for an exact compensation of an image at infinite distance. Lens details play no rôle here.
At finite distances, you need extra accelerometers and Canon did actually file a patent explaining the obvious.
I would have to disagree not perhaps with your statements but the issue at hand.
I don't know how others shoot, but my shots are very very rairly at infinity. as a result, while you may be correct in your statements, for other than infinity you need to determine if shake is rotational around some point, or purely lateral,
That is what I was getting at, and since the center of mass and the theoretical location of the objective (i forget the term) in each of my 3 examples is quite different, in the real world the SR needed is lens dependant. I don't use my 500mm to look at a flag 2 miles away, I use it to look at a 10-15 cm high bird 10 meters or less away and fill the frame with it. To that end, however, as my first post indicates i like the performance