Panaceazz: screen fit button is button to autocorrect the image projected to screen.something it can react as a screen fit if the screen and projector are suitable.from my video U can see the image is so small compare with screen.so it can't fit the screen..but if U see my vdeo carefully, U can see screen fit at left and bottom of the screen.in this video I just want to show, how is screen fit can do..it can correctly adjust the image bcome straight although the prjector is not in cntre position