Ko te EFL (Effective Focal Length), e tohu ana ki te roa o te arotahi whai hua, kua tautuhia ko te tawhiti mai i te pokapū o te arotahi ki te waahi arotahi. I roto i te hoahoa whatu, ka whakarōpūtia te roa o te arotahi ki te roa o te taha whakaahua me te roa o te taha ahanoa. Inaa, ko te EFL e pa ana ki te roa o te arotahi taha-a-ahua, ara, te tawhiti mai i te rererangi matua taha-a-ahua ki te taha-a-ahua. Ko tetahi o nga tawhā nui i roto i te hoahoa punaha whatu, EFL tino awe i te mahinga o te punaha. Ko te roa o te arotahi he poto rawa ka puta he koki tirohanga tino whanui, ka kaha ake te koki me nga wero ki te whakahaere i te koki putanga o te hihi matua. Engari, ko te roa o te arotahi he tino roa ka aukati i te hoahoa punaha kiato me te kore e tutuki i nga whakaritenga tono na te mea he tino whaiti te tirohanga.
Ko te BFL (Te Roohanga Whakamuri), ko te roanga arotahi whakamuri ranei, he tawhiti mai i te mata o muri o te arotahi whakamutunga i roto i te punaha whatu ki te rererangi atahanga. Hei tawhā matua i roto i te hoahoa whatu, BFL tika pānga te roa pūnaha whānui me te tika o te roa arotahi muri. Na reira, me ata whakaarohia i te wa e hoahoa ana te punaha.
Ko te FFL (Front Focal Length), ko te roa o te arotahi o mua, he tohu i te tawhiti mai i te mata o mua o te arotahi tuatahi i roto i te punaha whatu ki te mata ahanoa. He mea nui kia mohio he rereke te rereketanga o te FFL mai i te FBL (Flange Focal Length). Ko te mea o mua e tohu ana i te tawhiti whatu, ko te mea whakamutunga ko te tawhiti miihini.
Ko te FBL (Flange Focal Length), ko te roanga arotahi flange ranei, kua tautuhia hei tawhiti mai i te mata miihini whakamutunga ki te mata atahanga o te roopu arotahi. I roto i te hoahoa o nga atanga kamera me te arotahi, ko te FBL he tawhā tino nui e whakatau ana i te tuunga tika e mau ai te arotahi ki runga i te kamera.
Hei whakarāpopototanga, he mea nui enei tawhā ki te hoahoa o nga arotahi whatu. Ehara i te mea ka awe noa i te mahinga o te arotahi me te kounga atahanga engari ka tino pa ki te kaha o te hoahoa punaha.
Wā tuku: Hune-06-2025