Abstract: Indirectly driven capsule implosions are driven by four shock waves whose strength and relative timing must be controlled to high precision to keep the fuel on a low adiabat. The symmetry during the first 2 ns should be tuned carefully. The mainline tuning targets chosen are the high Z re-emission spheres. For record of instantaneous asymmetry during the first 2 ns, multiple images in the time of the soft X-ray re-emission from a non-imploding Bi ball on SGⅡ facility were taken in 2011. The re-emitted images with hohlraum lengths of 1350 m and 1500 m were obtained and the experimental P2/P0 and P4/P0 time histories were deduced. A simple analytical view-factor model is established, and the simulation result of P2/P0 is in agreement with the measured P2/P0.