Iilensi zeVarifocalluhlobo lwelensi olusetyenziswa kakhulu ekufoteni. Zingatshintsha i-engile yokudubula kunye nokwakheka kwayo ngokulungelelanisa ubude be-focal, zivumele ilensi enye ukuba idubule iindawo ezahlukeneyo ngaphandle kwesidingo sokutshintsha iilensi rhoqo, ngaloo ndlela zifezekisa "ilensi enye kuyo yonke into".
1.Iingenelo eziphambili zei-varifocaliilensi
(1)Ukuguquguquka kokwakheka
Xa kuthelekiswa neelensi ezigxile kwi-fixed focus, iilensi ze-varifocal zinokugubungela ubude obuninzi be-focal kwilensi enye, zibamba iimbono ezahlukeneyo. Zivumela ukutshintsha ngokukhawuleza ukusuka kwi-wide-engile ukuya kwi-telephoto ngaphandle kokutshintsha iilensi, nto leyo ezenza zifaneleke ngakumbi kwiimeko ezifuna ukulungiswa ngokukhawuleza kokwakheka, njengokuhamba kunye nokufota iziganeko.
Umzekelo, ukusuka kwiindawo ezibanzi ukuya kwiindawo ezikufutshane zezinto ezikude, ukusebenzisa ilensi yokusondeza kubandakanya nje ukujikeleza iringi yokusondeza, ukuthintela ukuba ungaphoswa lixesha ngokutshintsha iilensi.
(2)Ukuphatheka lula kunye nokusebenza lula
Ilensi enye ye-varifocal inokugubungela i-wide-engile ukuya kwi-medium telephoto, ihlangabezana neemfuno ezahlukeneyo zokudubula. Ingathatha indawo yeelensi ezininzi ezigxile kwi-fixed focus, inciphise ubunzima bokuthwala kunye nexesha elichithwa utshintsha iilensi, okwenza ukuba ifaneleke kwiimeko apho kufuneka uhambe khona ngokukhanya, njengokufota esitalatweni kunye nohambo lokuhamba ngeenyawo.
Umzekelo, xa kufotwa esitratweni, ilensi ye-telephoto ingasetyenziselwa ukufota ngokukhawuleza indawo yentaka ebonakala ngequbuliso ibhabha okanye isiganeko esikude, ngelixa ilensi ye-wide-engile ingasetyenziselwa ukufota imifanekiso yabantu ekufutshane.
Iilensi zeVarifocal zibonelela ngolwakhiwo oluguquguqukayo kunye nokusebenza okuphezulu
(3)Amandla okudubula anamandla
Kwimifanekiso eshukumayo efana nevidiyo, iilensi ze-zoom zivumela ukulungiswa kweringi ye-zoom ngesandla okanye nge-motor ukuze i-zoom in and out, ikhokela iliso lombukeli, idale i-zoom egudileyo yeziphumo zentshukumo yekhamera, kwaye ivelise neziphumo ezikhethekileyo zokudala. Umzekelo, ukusebenzisa ilensi ye-zoom ukutyhala iringi ye-zoom ngesantya esicothayo se-shutter kunokuvelisa isiphumo se-radial dynamic.
(4)Ziqhelanise ngokukhawuleza neemeko ezitshintshayo
Kwiimeko apho ukukhanya, indawo, kunye nomxholo zihlala zitshintsha, ezifana nokufota esitalatweni, ukurekhodwa kweziganeko, kunye nokuhamba, iilensi ze-zoom zikuvumela ukuba ulungise ngokukhawuleza ukugxila ukuze ujongane neemeko ezahlukeneyo ngaphandle kokutshintsha iilensi ngokungxama.
2. I-Varifocaliingcebiso zokusebenzisa iilensi
Ngelixaiilensi ze-varifocalZibonelela ngezinto ezininzi ezilula kunye nenkululeko yokuyila ekufoteni, izakhono ezithile zokusebenzisa ziyafuneka ukuze kuphuhliswe amandla azo apheleleyo.
(1)Tshatisa ubude obahlukeneyo befocal ngokwendawo
Ukusebenzisa ubude obahlukeneyo befocal kunokuvelisa iziphumo ezahlukeneyo zemifanekiso, kwaye iziqendu ezahlukeneyo zifuna ubude obahlukeneyo befocal. Umzekelo:
Iilensi ezibanzi zifanelekile kwiifoto zomhlaba kunye nezakhiwo, zigxininisa umbono kunye nobunzulu bendawo, kodwa kufuneka kuthathwe unonophelo ukuze kuthintelwe ukugqwetheka kwimiphetho yomfanekiso;
Ubude obuqhelekileyo befocal bufanelekile kwiifoto zasezitalatweni nakwiifoto ze-portrait, bubonelela ngombono osondeleyo wobomi bemihla ngemihla ngelixa bukwaqwalasela nokusingqongileyo, okwenza ukuba zifaneleke kwiifoto zedokhumentari, ngoxinzelelo lwendalo kunye nokufiphala kwemvelaphi ethambileyo;
Iilensi zeTelephoto zifanelekile kwiifoto zezilwanyana zasendle nezemidlalo, zivumela ukufota umgama omde ngelixa ziphepha ukuphazamiseka komxholo, zithatha iinkcukacha ezikude, kwaye zisusa imvelaphi exineneyo ukuze ziqaqambise umxholo.
Iilensi zeVarifocal zinokufaniswa nobude obuhlukeneyo befocal ngokwendawo
(2)Ukugxila ngobude obude bokugxila
Xa usebenzisa ilensi ye-varifocal, gxila kuqala kumgama we-telephoto, uze ukhethe ubude obufanelekileyo bokufota. Oku kuphucula ukuchaneka kokugxila. Kumgama we-telephoto, umfanekiso womntu mkhulu ngelixa ubunzulu bentsimi bubuncinci, nto leyo eyenza kube lula ukujolisa ngokuchanekileyo. Oku kuluncedo ngakumbi kwiimeko zokukhanya ezikhanyayo okanye ezinzima, apho ukusebenzisa ilensi ye-telephoto kuvumela ukulinganisa okufanelekileyo kwendawo.
(3)Musa ukuthembela kakhulu kwi-zoom,phepha ukwakheka kobuvila
Ukulula kokusetyenziswa kweiilensi ze-varifocalkunokukhokelela ngokulula kwindlela yokwenza izinto ngaphandle kokwenza izinto, ukuxhomekeka kuphela ekujikeleziseni iringi ye-zoom ukuze kubhalwe iifoto, nto leyo ebangela ukuxhomekeka kakhulu kwi-zoom kwaye mhlawumbi kunciphise inyathelo lokwenziwa kwayo. Kubalulekile ukuqaphela ukuba ukutshintsha ubude be-focal yelensi kutshintsha ibala lokujonga, ngelixa ukuhambisa ikhamera kutshintsha indlela ebonwa ngayo.
Ukuhambisa ikhamera kufutshane okanye kude kunokudala iziphumo ezahlukeneyo kakhulu zendawo kunye noxinzelelo lwangasemva. Ke ngoko, ukusebenzisa ilensi ye-varifocal kufuna ukuhambahamba ukuze ufumane i-engile yokudubula efanelekileyo uze ulungise ubude be-focal ukuze wenze imifanekiso esemgangathweni ophezulu.
(4)Naka uiuzinzoyeisiphelo se-telephoto
Iilensi zeTelephoto zidla ngokushukunyiswa yikhamera, nto leyo ebangela imifanekiso engacacanga. Kwiimeko ezinjalo, kuyimfuneko ukwandisa isantya se-shutter okanye ukusebenzisa izixhobo zokuzinzisa umfanekiso. Ingakumbi xa usebenzisa iilensi ze-varifocal ezinobude obuyi-200mm nangaphezulu, kuyacetyiswa ukuba usebenzise i-tripod okanye isixhobo esifanayo ukuzinzisa ilensi. Oku kunciphisa ukushukunyiswa kokudubula okubanjwe ngesandla, kuqinisekisa uzinzo lokudubula, kwaye kuphucula ubukhali bomfanekiso.
Uzinzo lubaluleke kakhulu xa ufota ngelensi ye-telephoto
(5)Nika ingqalelo kutshintsho olukwi-aperture kunye nobunzulu bentsimi
Ubuninzi bomngxuma kwiilensi ezininzi ze-zoom buyancipha njengoko ubude be-focal bukhula. Oku kuthetha ukuba kwisiphelo se-telephoto, ubuninzi bomngxuma buncinci, nto leyo enciphisa ubungakanani bokukhanya okungena kwilensi kwaye inciphisa ukufiphala kwangasemva. Ke ngoko, kwiimeko zokukhanya okuphantsi okanye xa kufuneka ukufiphala kwangasemva okunamandla, sebenzisa isiphelo se-wide-engile yelensi okanye wandise i-ISO.
Ukuze ufumane isiphumo esikhulu se-bokeh kwisiphelo se-telephoto, kunokufuneka i-aperture enkulu okanye umgama osondeleyo wokudubula. Ngaphezu koko, ukulawula ubunzulu bentsimi, ungazama ukuqonda impembelelo yobude obahlukeneyo bokugxila kubunzulu bentsimi. Umzekelo, ukudubula ngobude obufutshane bokugxila uze usondeza ngaphakathi kunokwenza imvelaphi ibe bukhali, ngaloo ndlela ufumane ubunzulu obuluncedo bentsimi.
(6)Sebenzisa i-lens hood ngokufanelekileyo
Iilensi zeVarifocalzinesakhiwo esintsonkothileyo kunye neqela elikhulu leelensi zangaphambili, nto leyo eyenza ukuba zibe sesichengeni sokukhanya okungaqhelekanga, nto leyo enokubangela ukugqabhuka nokudumba. Ukusebenzisa i-lens hood kubalulekile ekunciphiseni ezi ziphumo zokugqabhuka; ukusebenzisa uhlobo oluchanekileyo lwe-lens hood kunokuphucula umgangatho womfanekiso kunye nomahluko, ngaloo ndlela kuphucula umgangatho wefoto.
(7)Sebenzisa izihluzi ngononophelo
Akukhuthazwa ukusebenzisa izihluzi kwiilensi ze-zoom ngaphandle kokuba kuyimfuneko ngokupheleleyo. Kwiindawo ezithile, ezinje ngeelwandle okanye kwiindawo ezinamanzi anetyuwa, izihluzi ezikhuselayo okanye ezidibanisa ukukhanya zingasetyenziswa, kodwa ukusebenzisa ezinye izihluzi kuya kwandisa iingxaki zokukhanya ngaphakathi kwilensi, nto leyo enokubangela ukuba kubekho ukuphindana.
Xa usebenzisa ilensi ye-varifocal, qaphela indlela yokuphatha ukukhanya
Ukongeza, iimeko ezahlukeneyo zokudubula zifuna iindlela ezahlukeneyo xa kusetyenziswa iilensi ze-varifocal. Umzekelo, kwifoto yokuhamba, ilensi ye-zoom ingagubungela i-wide-engile ukuya kwi-telephoto kwilensi enye; i-aperture encinci ingasetyenziselwa ukufota indawo emini, ngelixa ilensi ye-telephoto ephakathi ene-aperture enkulu ingasetyenziselwa ukufota esitalatweni xa kutshona ilanga.
Ukuququmbela,iilensi ze-varifocalzibonelela ngokuguquguquka okuphezulu kokuyila, zixhasa izifundo zokudubula ezifuna ukwenziwa ngokutsha. Nangona kunjalo, njengomfoti, ukuba nobuchule nje bobuchule belensi ye-varifocal akwanelanga; ukuziqhelanisa okubanzi kunye namava okusebenza ngezandla kubalulekile ukuguqula ezi zakhono zibe yingqiqo, okukuvumela ukuba usebenzise ngokupheleleyo iingenelo zeelensi ze-zoom kwaye uphathe iimeko ezahlukeneyo zobungcali ngokulula ngakumbi.
Ixesha leposi: Disemba-26-2025
