The camera is a HDR-UX3 Sony Handycam. I have only just started to use a Mac, I am using iMovie 11. I bought the mac because I wanted to have a go at editing some video footage, but it looks as if this model is not compatible. If I decide to buyt a new camera I wanted to choose one which would definatley work well with iMovies.
In theory, your camera does work with iMovie 11.
Please read through this:
Then, if you're still having trouble, please tell me the process (steps) you're using to get the video in to iMovie.
And tell me the actual iMovie version from iMovie menu > About iMovie.