On 04.6.15 11:16 AM, "Tom Reese" <[EMAIL PROTECTED]> wrote:
> Alan, I don't know why the camera or lens would have to detect movement. > That would require some type of accelerometers and would be a finicky cludge > IMO. I do not pretend to know much about how they achieve IS effect, but I remember reading an article somewhere which said that the Canon style in-lens IS has two small gyros to detect X/Y axis movement, and the required lens shift amount is computed and actuated on a microsecond order (or something like that). On video cameras, Canon uses Vari-angle prism which is essentially a clear gel-like material sandwiched between two plain glasses which are normally parallel each other. When the movement is detected, the angle of these two glasses changes, or some such fancy thing. Don't ask me why this is not adopted in 35mm lens etc. I think Canon site must have some explanation pages somewhere. Cheers, Ken
