A projection system having a prescribed relationship between the condenser
and the projection lens is disclosed, where an imager gate normally
coinciding with a projection object plane is between and spaced away from
a condenser back focal plane and a condenser image plane. The condenser
images an extended source onto the condenser image plane. A pixilated
panel or film defining a graphic image is located at the imager gate. The
magnification of the condenser is chosen so the image of the source is
essentially the same size as the pixilated panel. Positioning the imager
gate away from the condenser image plane provides blurring of any
brightness non-uniformities across the area of the source, providing a
relatively uniform illumination pattern whose outer shape matches the
shape of the imager gate.