The transient absorption kinetics of spinach photosystem II reaction centers were measured at 672 nm (detection bandwidth almost-equal-to 11 nm) following excitation at 310 nm. A temporal resolution of almost-equal-to 50 fs was used which is three times higher resolution than the current literature value. We observed a very fast absorption decrease with a rise time of 150 +/- 15 fs followed by a 13 +/- 4 ps recovery. The kinetics of the recovery step did not reveal a 3 ps component, however, a slight break in the data suggests a more complicated fit may explain the data as well or better. Based on a comparison of the rise time reported here and those reported by Durrant et al., the relaxation from S(n) to S(l) occurs very rapidly, within the 150 fs initial absorption decrease.