The lens is not rippled, it is aspherical.I've had many projectors and not one of them have been as fussy as this one. Needs to be properly square to the screen. Bit once I worked that out i can get the screen looking perfect in less than a min. How fussy it is surprised me, I guess it's just the way the lens is designed as you can see the front lens is rippled... almost like what you seeing on the screen. Other lens have always been one convex "curve"... not a ripple.