Yintoni ukufuna xa ukhetha lens? Imbobo - omnye parameters ezibaluleke kakhulu

Imbobo - le yenye engundoqo parameters apho ufuna ukunikela ingqalelo xa ukhetha lens. Imbobo isixhobo kokugcina ibonisa inqanaba eziphango yokumpompoza ukukhanya.

Ngamanye amazwi, i parameter ibonisa apho kudlula yinxalenye wobhobhozayo ngazo ngokwayo kwenkqubo lens njongo. Wobhobhozayo ukukhanya xa edlula isixhobo woqondo ngokupheleleyo saa kwaye kuboniswe ilens uxhasiwe lilo ebambekayo ilens bagqibileyo (iplastiki optical, iglasi). Ngenxa yoko, kusenokuba kakhulu buthathaka ngenxa ezi mpawu emzimbeni.

Noko ke, asiyiyo parameter kuphela egqiba amandla ukukhanya-ukuqokelela, apho kuyimfuneko ukunikela ingqalelo xa ukhetha lens. Imbobo device kokugcina kuxhomekeke emngxunyeni eliphezulu evulekileyo. Evulekileyo ngakumbi emngxunyeni, engena ilens nokukhanya ngaphezulu. Yaye ekubeni emngxunyeni lens leyo f / 1.8 okanye 1: 1.8, ithathwa ngakumbi xa kuthelekiswa eliphezulu-umngxuma lens, f / 2.8 okanye 1: 2.8. Amaxesha amaninzi, ukuze lula, umlinganiselo yomgodi isixhobo woqondo emiselwe inqanaba imbobo eliphezulu ezivulekileyo, nto leyo evumela ukuba kubeke lens. Noko ke, umlinganiselo beso i iimpawu ezingundoqo iimpawu noshowo kwenkqubo woqondo kunye ixabiso yomgodi uvalo owenza kuphela eminye imisebenzi enxulumene kunye nokumisela emngxunyeni ratio kwefowuni. Noko ke, ukususela kwindawo ezenziwayo, kulula ukuba ukuthelekisa iilensi ye parameter kwexabiso liphezulu kangangoko emngxunyeni evulekileyo. Ngoko ke yintoni na ezi ngcamango zimbini kuthathwa twatse.

Emngxunyeni ratio kwenkqubo woqondo usoloko kubonisiwe ngokweemfuno ilens zemigaqo, kodwa kwakhona ukuphawulwa umzimba isixhobo kufutshane phambi lens. Umzekelo, emngxunyeni lens Canon 24-70 f / 2.8. Kuyabonakala ukuba loo Ilens ukudubula ukuvumela ukuvulwa emngxunyeni ukuya kutsho kuma-2.8. Oku kuthetha ukuba isixhobo akayi kuvumela uvalo kulibhala 2.0, 1.8 no-njalo. D.

Ilens, leyo umngxuma ikuvumela lokudubula kwinqanaba ixabiso umngxuma f / 1.2 ukuya f / 2.8, uthathwa ephezulu-imbobo. Devices nge kwinqanaba evela f / 3.5 ukuya f / 6.3, alibhekiseli phezulu-umngxuma, lidla ngokubizwa ngokuba "mnyama" njengoko bedlula imali encinci ngobhobhozo ukukhanya. Ezinye iinkokeli ukwenziwa kweenkqubo ezamehlo (umz, Leica kunye Carl Zeiss), iphatheni Izixhobo ukukhululwa kunye kwinqanaba iqaqambile evela f / 0.7 ukuya f / 0,95. Ezi lens eliphezulu-umngxuma iqhelekileyo phakathi abafoti - kukho izixhobo ezixabisa f / 1.4 ukuya f / 2.8.

Ngoku cinga yintoni isiphumo ucwangciso ratio beso. Zonke iinzuzo zezi lens zinxulunyaniswa ixabiso beso. Oku kungenxa yokuba xa zokudubula umngxuma kuchaphazela isixa kokudlulisela ukukhanya ngemehlo kunye nobunzulu yentsimi kwisakhelo. Ngenxa yoko, i-digital kwekhamera beso kuchaphazela ukukwazi ukuqhuba uphando ekukhanyeni norhatyazo. I elikhulu ixabiso beso, i abancinane ubunzulu yentsimi yesakhelo, oko kukuthi izinto ezinamandla razmoyut ukuba musa kuwa phakathi kwindawo ekugxilwe.