jamaeolus wrote in post #16311863
Curious about IS. Anybody know HOW it works? I have a Pentax point and shoot with zoom that describes its software solution as averaging the lines it finds over time. But that doesn't explain the Canon system where some lenses do it and others don't.
It's actually very crazy.
There are a series of motion sensors in the lens itself that sample at something like 1000 times a second. There is a "floating" lens element that is suspended with a series of springs and magnets that actually shifts in real time to compensate for the shake of the camera, keeping the final image optically stable. The system is only energized when you start the AF process or are running liveview - you can see the optical "jump" as the floating element gets into full alignment when IS starts on many lenses. It's a crazy technology.
The P&S Pentax is doing software image stabilization - it does not have a moving part, but instead, as they say, it averages the values, generally this comes with a sacrifice of sharpness.