Actively focused lightweight heliostat

A heliostat, comprising:

• a reflecting surface;
• an elastically deformable frame on which the reflecting surface is mounted;
• a truss structure behind said elastically deformable frame comprising at least four bracing struts with first ends attached to said elastically deformable frame and second ends attached to at least one node located centrally behind the elastically deformable frame;
• at least one actuator connected to at least one of said at least four struts at said at least one node;
• an electronic control system configured to communicate with said least one actuator;
• and
• a dual-axis mount to support and orient the reflecting surface, the elastically deformable frame, the truss structure and the at least one actuator forming an assembly,
• wherein actuation of said at least one actuator in response to said electronic control system causes compression or tension of at least one of said at least four bracing struts to thereby control a shape of said reflecting surface and said elastically deformable frame in at least low order bending modes.