Yini i-fixed focus lens?

Njengoba igama liphakamisa, aI-lens yokugxila egxilileiwuhlobo lwelensi yokuthatha izithombe enobude obugxilile obugxilile, obungakwazi ukulungiswa futhi obuhambisana nelensi yokusondeza.

Uma kuqhathaniswa, amalensi okugxilisa agxilile ngokuvamile anembobo enkulu nekhwalithi yokubona ephezulu, okuwenza afanelekele ukuthatha izithombe zekhwalithi ephezulu.

Umehluko phakathi kwamalensi okugxilisa agxilile namalensi okusondeza

I-fixed focus lens kanye ne-zoom lens yizinhlobo ezimbili ezivamile zamalensi ekhamera, futhi umehluko wawo omkhulu ulele ekutheni ubude bokugxila buyalungiseka.Zinezinzuzo zazo uma zisetshenziswa ezimweni ezihlukene zohlelo lokusebenza.

Isibonelo, ilensi yokugxila egxilile ifanele ukusetshenziswa ezimeni zokukhanya okwanele, ukuphishekela ikhwalithi yesithombe esiphezulu, namatimu okuthwebula azinzile, kuyilapho i-zoom lens ifaneleka kakhulu izigcawu ezidinga ukusondeza okuguquguqukayo, njengokuthwebula izithombe zezemidlalo.

Ilensi yokugxila egxilile

Ubude bokugxila

Ubude bokugxila belensi yokugxila egxilile bugxilile, obufana no-50mm, 85mm, njll., futhi abukwazi ukulungiswa.I-zoom lens ingalungisa ubude bokugxila ngokuzungezisa noma ukusunduza nokudonsa umgqomo welensi, okuvumela ukukhetha okuguquguqukayo phakathi kwe-engeli ebanzi ne-telephoto.

Oukusebenza kwe-ptical

Ngokuvamile, aI-lens yokugxila egxilileinekhwalithi engcono yokubona kune-zoom lens ngoba ukwakheka kwayo kulula futhi akudingi ukucatshangelwa kokunyakaza kwamalensi noma izakhiwo eziyinkimbinkimbi ze-optical.Uma kuqhathaniswa, amalensi okugxilisa agxilile ngokuvamile anembobo ephezulu (enenani elincane lika-F), elinganikeza ikhwalithi yesithombe engcono, ukukhanya okukhulu, kanye nemiphumela engcono yokufiphalisa ingemuva.

Kodwa manje ngokuthuthukiswa kobuchwepheshe, amanye amalensi okusondeza aphezulu angafinyelela izinga lamalensi agxilile agxilile ngokuya ngokusebenza kokubona.

Isisindo nevolumu

Isakhiwo selensi yokugxila engashintshi silula, ngokuvamile sincane futhi silula ngosayizi.Isakhiwo se-zoom lens siyinkimbinkimbi uma kuqhathaniswa, ehlanganisa amalensi amaningi, ngakho-ke ivamise ukuba nzima futhi ibe mkhulu, okungenzeka kungabi lula kakhulu ukuthi abathwebuli bezithombe basebenzise.

Indlela yokudubula

Ilensi yokugxila egxililes afanele ukudubula izigcawu ezithile noma izifundo, njengoba ubude bokugxila bungenakushintshwa, futhi amalensi afanele adinga ukukhethwa ngokusekelwe ebangeni lokudubula.

I-zoom lens iyavumelana nezimo futhi ingalungisa ubude bokugxila kuye ngokwezidingo zokudubula ngaphandle kokushintsha indawo yokudubula.Ifanele izigcawu ezidinga izinguquko eziguquguqukayo ebangeni lokudubula kanye ne-engeli.