| rest frame strmgren photometry ( 3500 , 4100 , 4750 and 5500 ) is presented for 509 galaxies in 17 rich clusters between @xmath0 and @xmath1 as a test of color evolution . our observations confirm a strong , rest frame , butcher - oemler effect where the fraction of blue galaxies increases from 20% at @xmath2 to 80% at @xmath3 . we also find that a majority of these blue cluster galaxies are composed of normal disk or post - starbursts systems based on color criteria . when comparing our colors to the morphological results from hst imaging , we propose that the blue cluster galaxies are a population of late - type , lsb objects who fade and are then destroyed by the cluster tidal field . after isolating the red objects from butcher - oemler objects , we have compared the mean color of these old , non - star forming objects with sed models in the literature as a test for passive galaxy evolution in ellipticals . we find good agreement with single burst models which predict a mean epoch of galaxy formation at @xmath4 . tracing the red envelope for ellipticals places the earliest epoch of galaxy formation at @xmath5 . |