If it killed the picture quality I would not be using it....
I don't like the Zoom phrase. On some DVD players zoom actually stretches the width and height, which is not what your doing here. You are leaving the width alone, and stretching vertically to fill the unused 33% of pixels that are lost when watching 2.35 material on a native 16:9 projector. The lens then reformats the movie to fill your 2.35 screen. Also, I"m not talking about the zoom on the lens, but the zoom menu option. AVSForum is really the best place for information....