I was trying to do a frame change on le1200. After tracing the new frame, the shape of the frame was shown on the screen. While i press the FC button, the lines of the shape became lighter shade and fainter. Next, i trace the old lens and the shape of the old lens is suppose to overlap the shape of the frame on the screen. But somehow, the shape of the lens does not appear on the screen. Any expert here encountered this problem before?