def after_read(record, scan):
    filename = get_exec_pars().path + "/img_" + str(record.index) + ".tiff"
    axis.update()
    axis.saveSnapshot(filename, "tiff")
    
lscan(BML_DIAG_POSITION, CADC2, 3.3, 6.2, 0.05, after_read=after_read)