When using the new fisheye camera in lightwave 9.6 my rendered image is a square fisheye image which matches whatever resolution I have set (1024 x 1024, 1400 x 1400 or whatever).

Is there an option to mask out the area outside the central circular portion of the image so that it is a true fisheye image ? This would help as a guide to show what aspects of the image would be visible when the final render is displayed on a full dome screen.