Ko ngā karāhe F-Theta e whakamahia whānuitia ana me ngā whakaata matawai galvanometer i roto i ngā pūnaha whakairo, tapahi, me te tohu laser. Ko te tikanga, ka iti iho i te 1% te whakapōturitanga F-Theta o te karāhe kia taea ai te whakaputa i tētahi wāhi tika i roto i te papa papatahi o te papa whakaahua.
E 20 tau te roangaru e arotahi ana ki te whakarato i ngā hua whatu tino tika.