We present H{alpha}-derived SFRs for three z~0.75 galaxy clusters. Our 1{sigma} flux limit corresponds to a star formation rate (SFR) of 0.10-0.24h^-2^_100_M_{Sun}/yr, and our minimum reliable H{alpha}+[NII] rest-frame equivalent width is 10{AA}. We show that H narrowband imaging is an efficient method for measuring star formation in distant clusters.