Hi, suppose i buy a camcorder with a decent built-in ois stabilise system: pa he new Panasonic AG-AC90, put it on a handheld stabiliser....will this further "improve" the smoothness, non-shaky glide?
Or will it be the oppposite? Or none improvement? Or ...?
Ayone tried this method?

thanks

Most definitely.

The AC90 has been praised for its stabilization so would be perfect with an additional shoulder mount so to speak.