Imaging of galaxy cluster AC 106 (z = 0.232) through the new TTF filters: (left) 812/31 nm and (right) combined 758/29 and 909/40 nm. The presence of H [N II] line emission in one object is evident from comparing the two images. Exposure times were 900 s for both 812/31 and 909/40 and 600 s for 758/29. These exposures were taken prior to a full scan through the cluster redshift range with tunable narrowband imaging (see inside this issue, p. 3) from which we obtain an accurate redshift for the galaxy.