He maha ngā pai me ngā pūtake matua o ngā kēti tauranga tohu holo. Tuatahi, he whiwhi i te āhua matua o te karo whakamātau, ā, e taea ana e ngā whakamahi ki te tirotiro haere i ngā mahi hei whakamana i ngā nuihono, engari kaore i te hiahia ki ngā rauemi taketake. Ko ngā āhuatanga optika katoa o ēnei kēti he waihanga pai ki te kitea noa, ko te tino whakamātau, ko te wehe raweke i te whakaputu mai i te whakawhitiwhiti whenua. Ko te ahua tamaiti ake o ēnei kēti he whakatakoto i te whakaaweawe, e ai ki reira, ko ia tonu te pūnaha whakamana motuhake mo ngā take whakamaharatanga. Heoi anō, ko te whakarite i ēnei kēti he pai utu i ētahi atu rauemi whakamaharatanga, e tuku ana i te whakamana tuatahi ki runga i te whakapae pai, ki te mea kaore i te hiahia ki te whakatū i te moni nui. Noho ake nei, kei te whai mana hoki ēnei kēti ki te whakamahi, e mau ana ki ētahi atu mata ki runga i ngā whenua rerekē, ā, ka mau tonu i aua pūtake whakamana. Ko te roa o te whakamana holo e whai ana i te tūpato, e whai ana i te whakapae pai mo te roa, e whakatupu ana i te whakamana motuhake, e whakapae ana ki te wehiweti, ki ngā panoni paetūnga, me te whakapae pai ki te whakapae pai. Mo ngā pakihi, ka whakamana ēnei kēti i te mana tangata, ā, ka whakapai hoki i te whakaaturanga o ngā nuihono ki runga i ō rātou uara holo pai. Ko te tino taea ki te whakatipu i ēnei kēti me ngā tohu kāwanatanga, me ngā tauanga rerenga, me ngā take whakamana motuhake, ka whakatupu i ngā rauemi whakamana katoa e whakapai ana ki a rātou hiahia. Heoi anō, ko te whakatū i ngā kēti tauranga tohu holo ka whakaae hoki ki ngā kāwanatanga i ngā whenua e hiahiatia ana te whakamana nuihono, pērā i ngā rongoā me ngā rorohiko.