Iilensi zeTelephoto, njengoko igama lisitsho, zinobude obude befocal kwaye ngoko ke zinendawo encinci yokujonga, nto leyo eyenza zifaneleke ukufota abantu abakude. Kwi-astrophotography, iilensi ze-telephoto azifanelekanga ukufota isibhakabhaka sasebusuku, ingakumbi kwimifanekiso ebanzi yeendawo ezinkulu zesibhakabhaka.
1.Imida yokusebenzisa iilensi ze-telephoto ukufota isibhakabhaka ebusuku
I-Astrophotography idla ngokusebenzisa iilensi ezinee-engile ezibanzi; xa kuthelekiswa, iilensi ze-telephoto zinemida ebaluleke ngakumbi xa kufotwa isibhakabhaka ebusuku:
(1)Ibala elimxinwa lombono lenza kube nzima ukuthwebula isibhakabhaka sonke ebusuku
Iilensi zeTelephoto zinombono omxinwa, ngokubanzi zingaphantsi kwama-30°, kwaye azikwazi ukubamba yonke iMilky Way okanye ububanzi obukhulu besibhakabhaka sasebusuku. Isibhakabhaka sasebusuku (njengeMilky Way) sithatha indawo enkulu (enobubanzi obuthe tye obungaphezulu kwama-100°).
Xa usebenzisa ilensi ye-telephoto, ungathatha kuphela inxalenye yesibhakabhaka sasebusuku (njengeqela elincinci leenkwenkwezi okanye inkwenkwezi enye ekhanyayo), nto leyo eyenza kube nzima ukubonisa uhlobo olupheleleyo lweMilky Way okanye iindlela zeenkwenkwezi ezinkulu.
(2)Ixesha elincinci lokuvezwa linokubangela ukuba umntu alandele emva njengeenkwenkwezi
Ngenxa yobude bazo obude befocal, iilensi zetelephoto zibangela amaxesha amafutshane kakhulu okuvezwa. Ngaphandle kwamaxesha amade okuvezwa ukuze kubanjwe ukukhanya okwaneleyo, iinkwenkwezi ziya kubonakala njengemigca engacacanga ngenxa yokujikeleza koMhlaba, nto leyo echaphazela umgangatho womfanekiso. Ke ngoko, xa usebenzisa iilensi zetelephoto ukufota isibhakabhaka sasebusuku, izixhobo ezifana nee-equatorial mounts zihlala zifuneka ukunciphisa imiphumo yokuhamba kweenkwenkwezi.
(3)Ukuvulwa komngxuma kuncinci kakhulu, nto leyo ebangela ukuba kungangeni kukhanya ngokwaneleyo
Iilensi zeTelephoto zihlala zinemingxuma emincinci, ngelixa i-astrophotography idla ngokufuna imigxuma emikhulu (efana ne-f/2.8 okanye i-f/1.4) ukuze kwandiswe ukuhlangana kokukhanya kunye nokufinyeza ixesha lokuvezwa. Imingxuma emincinci yeelensi zeTelephoto ibangela umfanekiso omnyama, odinga uvakalelo oluphezulu lwe-ISO, nto leyo enyusa ingxolo yomfanekiso kwaye ichaphazele umgangatho womfanekiso.
Imida yokusebenzisa iilensi ze-telephoto ukufota isibhakabhaka ebusuku icacile.
(4)Ukwakheka kunye nokugxila kunzima ngakumbi
Ukufota ngeenkwenkwezi kufuna ukugxila ngokuchanekileyo ukuya kwi-infinity (∞), kodwa iilensi ze-telephoto zinendawo ecacileyo yokujonga kunye nobunzulu obungaphantsi kakhulu bentsimi. Ukugxila ngesandla kunye nokwakheka kunokubangela iinkwenkwezi ezifiphele ngenxa yeempazamo ezincinci. Oku kufuna ukuxhomekeka ekukhuliseni umbono ophilayo ukuze kugxilwe ngesandla kwinkwenkwezi ekhanyayo, okwenza inkqubo ibe nzima ngakumbi. Ngokwahlukileyo koko,iilensi ezineekona ezibanziinobunzulu obukhulu bentsimi, nto leyo enika unyamezelo olukhulu kwiimpazamo zokugxila.
(5)Iimfuneko zozinzo lwezixhobo ziphezulu kakhulu
Nokuba kukho indawo ekwi-equatorial, ukwandiswa okuphezulu kwelensi ye-telephoto kwandisa imiphumo yokushukuma kwekhamera. I-tripod ezinzileyo kunye nentloko ye-tripod eqinileyo zibalulekile, kwaye unokufuna ukusebenzisa i-mirror lock-up kunye ne-remote shutter remote/cable release ukunciphisa ukungcangcazela kwekhamera.
Ngaphezu koko, ukudubula isibhakabhaka ebusuku ngelensi ye-telephoto kunokufuna indlela yokusebenza enzima emva kokucubungula ukuze kujongwane nemiba efana nombala weenkwenkwezi kunye nobukhali.
Iilensi zeTelephoto zifuna amanqanaba aphezulu kakhulu ozinzo lwezixhobo
2.Ukusetyenziswa kweelensi ze-telephoto ekufoteni isibhakabhaka sasebusuku
Nangonaiilensi zefowuniazifanelekanga ukufota iindawo ezibanzi zesibhakabhaka ebusuku, ziyasebenza kwiintlobo ezithile ze-astrophotography.
(1)Ukuthwebula imifanekiso eneenkcukacha zeendawo ezithile zesibhakabhaka sasebusuku
Iilensi zeTelephoto zinokukhulisa iindawo ezithile zesibhakabhaka sasebusuku, zibonise izinto ezikude ezinzulu esibhakabhakeni (ezifana ne-nebulae, amaqela eenkwenkwezi, kunye neegalaksi) okanye iinxalenye zeMilky Way, zizenze zibonakale kwifreyimu kwaye zityhile iinkcukacha ezimangalisayo kunye nomlinganiselo wobukhulu.
Umzekelo, zingasetyenziselwa ukufota ii-craters kumphezulu wenyanga, iinyanga zikaJupiter, okanye iinkcukacha zeenkwenkwezi ezidumileyo ezifana neOrion, nto leyo ekhokelela kwimifanekiso echaphazela ngakumbi.
(2)Ukucinezela ubudlelwane phakathi kwesibhakabhaka esineenkwenkwezi kunye nomhlaba
Ngokusebenzisa isiphumo "soxinzelelo lwendawo" seelensi zetelephoto, iindawo ezikude (ezifana neencochoyi zeentaba okanye ii-lighthouses) zinokudityaniswa ngokusondeleyo nesibhakabhaka esineenkwenkwezi, kuthintelwe ingxaki yokuba indawo ibonakale incinci kakhulu kwiifoto ezibanzi, kwaye kudalwa izinto ezikhethekileyo (umzekelo, ukwenza iincochoyi zeentaba zibonakale "zixhasa" inxalenye yeMilky Way). Olu xinzelelo lwendawo lwenza iinkwenkwezi zibonakale zixinene kwisakhelo, zidala isiphumo esimangalisayo sokubonakala.
Iilensi zeTelephoto zinokucinezela ubudlelwane phakathi kwesibhakabhaka esineenkwenkwezi kunye nomhlaba
(3)Ukufota inxalenye yeendlela zeenkwenkwezi
Iilensi zeTelephotoZisetyenziswa kwimifanekiso yemizila yeenkwenkwezi ukugxila kwicandelo elithile lezangqa zemizila yeenkwenkwezi ezijikeleze iPolaris, nto leyo ebangela ukuba kubekho ii-arcs ezixineneyo nezineeleya ezininzi, nto leyo ethintela ukubonakala "okuncinci" kweefoto zemizila yeenkwenkwezi ezineekona ezibanzi.
Ngamafutshane, iilensi ze-telephoto azilona khetho lufanelekileyo lwe-astrophotography kwaye zinemida ebalulekileyo kweli candelo; ngoko ke, kuyacetyiswa ukuba uqaphele xa uzikhetha. Kwi-astrophotography, iilensi ze-telephoto zilungele ngakumbi ukubamba iintlobo ezithile zezinto zasezulwini, njengezinto ezinzulu zesibhakabhaka kunye neendawo ezikufutshane zesibhakabhaka sasebusuku.
Iingcinga Zokugqibela:
Ngokusebenzisana neengcali eChuangAn, zombini uyilo kunye nokuveliswa kulawulwa ziinjineli ezinobuchule obuphezulu. Njengenxalenye yenkqubo yokuthenga, ummeli wenkampani unokuchaza ngokweenkcukacha ulwazi oluthile malunga nohlobo lwelensi ofuna ukuyithenga. Uthotho lweemveliso zelensi zikaChuangAn zisetyenziswa kwiintlobo ngeentlobo zezicelo, ukusuka ekujongeni, ukuskena, iidrone, iimoto ukuya kumakhaya akrelekrele, njl. IChuangAn ineentlobo ngeentlobo zeelensi ezigqityiweyo, ezinokutshintshwa okanye zenziwe ngokwezifiso ngokweemfuno zakho. Qhagamshelana nathi ngokukhawuleza.
Ixesha leposi: Februwari-24-2026
