Le mveliso isebenzisa ubuchwepheshe bokuqala bokujonga i-stereo yokujonga, obunokujolisa umbono we-binocular womjongi kwindawo emxinwa ukuze kuveliswe ibala elikhanyayo nelikhuliswe kakuhle lembono enamacala amathathu, libonelela ngombono okhethekileyo wobunzulu obunamacala amathathu ukuze kuhlolwe kwaye kunyangwe.