FIRST MAKE A ACRYLIC DOME , IT IS AS LIKE PARABOLIC SHAPE. IF DOME SHAPE IS DEEP, THEN FOCUS IS IN DEEP POINT . I HAVE A OLD PCS (18 " DIAMETER AND 8 INCH DEEP). ACRYLIC IS A OPTICAL CLEAR PLASTIC MATERIAL. HOT THE ACRYLIC SHEET AND BLOW. IN PAKISTAN TH
