  This paper presents deep narrow band photometry of the cluster A2317
(z=0.211) carried out using KPNO 4 m and Steward 2.3 m telescopes. Using rest
frame Stromgren photometry, it is determined that A2317 has an unusually high
fraction of blue galaxies (the Butcher-Oemler effect) for its redshift
(f_B=0.35). We demonstrate that the ratio of blue to red galaxies has a strong
dependence on absolute magnitude such that blue galaxies dominate the top of
the luminosity function. Spectrophotometric classification shows that a
majority of the red galaxies are E/S0's, with a small number of reddened
starburst galaxies. Butcher-Oemler galaxies are shown to be galaxies with star
formation rates typical of late-type spirals and irregular. Starburst systems
were typically found to be on the lower end of the cluster luminosity function.
In addition, blue galaxies are preferentially found in the outer edges of the
cluster, whereas the red galaxies are concentrated in the cluster core.
