what's the condensed format of the camera built by nikon corp., and has a weight less than 780.0?
(AND digicams.camera_compressed_format (JOIN digicams.camera_compressed_format.cameras (AND (lt digicams.digital_camera.weight 780.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN digicams.digital_camera.manufacturer m.03pmfw))))