Qoob loo faktor.Chto nws yog thiab yuav ua li cas ib qho tseem ceeb nws yog thaum xaiv ib cov koob yees duab.

Qoob loo zoo tshaj - ib lub sij hawm uas yog ntxiv rau cov phau ntawv txhais lus photographic cov ntsiab lus uas tus emergence thiab thoob plaws siv ntawm ib tug tshiab tiam ntawm cov koob yees duab. Nrog rau txoj kev loj hlob ntawm niaj hnub lub yees nyob rau hauv kev ua lag luam pib tshwm sim ntau thiab ntau cov SLR koob yees duab nrog ib tus nqi siv tau rau nonprofessionals. Tej tub lag luam, nyob rau hauv tas li ntawd mus nqi, paub qhov txawv tshwj tsis yog tias lwm qeb, rau cov uas xaiv lub koob yees duab - yog lub xov tooj ntawm megapixels. Nrog megapixels lawv tau cas figured tawm, thiab qhia vaguely, yog dab tsi tiag tiag tseem to taub hais tias cov ntau lub zoo dua ntaus ntawv. Txawm li cas los, raws li nws muab tawm, lwm tseem ceeb cov yam ntxwv txawv zoo ntawm ib cov koob yees duab, ib tug qoob loo zoo tshaj. Ua ntej koj yuav lub koob yees duab, sawv tseem los xyuas seb yog dab tsi nws yog.

Ob peb amateurs tsawg kawg ib zaug xav yog vim li cas, yog hais tias tus lens thiab lub lens muaj ib tug yeej zoo lawm, tus ncej nyob rau tib lub sij hawm lawv tau lub? Tsis muaj dab tsi nyuab nyob rau hauv cov lus teb rau lo lus nug no yog tsis muaj. Projecting lub yees duab duab mus rau lub xov xwm nyob rau hauv lub koob yees duab, cov lens optics tsuas txiav tawm "ntxiv" yog ib feem ntawm cov duab, muab nws ib lub zoo lawm. Nws yog yooj yim heev rau zus tau tej cov ib zaj duab xis muaj ib tug series ntawm lub ntas, thiab rau cov uas ua cov duab, thiab cov muab thiab lwm yam compact, thiab ntau yam.

Vim lub sij hawm ntev siv zaj duab xis dluab qhov luaj li cas ntawm tus ncej nyob rau hauv zaj duab xis tseem yuav siv tau raws li ib tug siv loj. Tsis muaj ib tug txawm tsis tshwm sim rau hloov nws txawm tam sim no, thaum shooting rau zaj duab xis yog yuav luag ib tug tshaj plaws ntawm yav dhau los. Niaj hnub no, nrog rau cov accession ntawm ib cov yees duab shooting nyob rau tshwj xeeb matrix, uas yuav tsum tau roughly piv nrog rau zaj duab xis.

Matrix, uas yog qhov loj ntawm lub coj zaj duab xis ncej, hu ua ncej tas. Txawm li cas los, feem ntau ntawm cov SLR koob yees duab yog ib tug matrix nrog ib tug loj me npaum li cas. Lawm nyob rau hauv xws matrices yog Vaj kub siab heev xwb lub hauv paus cheeb tsam ntawm cov duab uas yuav tau mus rau lub tag nrho-scale matrix. Dig muag, nws zoo li yog yees duab los ntawm ib tug lens ncej muaj ib tug ntev npaum li cas focal lengths.

Li no sawv lub sij hawm uas lub sij lub "nce" lub focal ntev, uas yog tsis tau tiag tiag tshwm sim, vim hais tias ntawm no, raws li nyob rau hauv peb tus yam ntxwv uas hloov lo ntsiab muag, tsuas txiav tawm lub txheej ib feem ntawm tus ncej. Nyob rau hauv lus Askiv lo lus "qoob loo" (cov qoob loo) yog txhais li "txiav". Li no lub npe ntawm lub sij hawm - lub qoob loo zoo tshaj, uas yog hais txog hais tias yog artificially nce focal ntev. Nws meej piav nyob rau tib lub sij hawm, nyob rau hauv qhov tseeb muaj yog tus txheej txheem ntawm shooting, raws li nyob rau hauv lub cev kev txiav txim zoo, lub koob yees duab lens focal ntev yog tsis tau hloov, tiam sis tsuas yog hloov lub kaum sab xis ntawm view.

Yog li, ncej ntau thiab tsawg 35 timillimetrovoy zaj duab xis 24x36 hli lawm thiab tseem yog cov siv, uas yog tam sim no cob cog rua thiab qoob loo zoo tshaj. Rau xws li ib tug ncej nws yog sib npaug zos rau 1. Thaum pib ntawm lub era, Nikon digital photography ntse ntsuav txiav txim siab hais tias nws yog ua tau rau ua cov SLR koob yees duab uas muaj peev xwm siv lawv nrog cov laus optics, uas yog ua rau xyoo lawm thiab feem ntau nqi ntau tshaj li cov koob yees duab nws tus kheej.

Txawm li cas los, nrog rau qhov kev siv ntawm lub tswv yim no peb muaj ib qho teeb meem. Tsim ib tug tag nrho-ntev sensor muaj pov thawj kim heev, thiab cia li dhau me me muaj tsis muaj taw tes.

Raws li ib tug tshwm sim ntawm researches lub sensor tau raug tsim muaj, uas yog kab pheeb ces kaum thiab ib tug ib nrab lub sij hawm tsawg tshaj li tus ncej 35 timillimetrovoy zaj duab xis. Yog li, rau xws li ib tug sensor 1.5 - qhov no yog nws cov qoob loo tau. Canon, incidentally, tom qab pom ib tug txawm zoo dua cov tshuaj. Qoob loo zoo tshaj ntawm nws cov lag ua sib npaug zos rau 1.6.

Yuav kom xyov txawv los ntawm nws, ib tug qoob loo zoo tshaj ntawm Nikon pib hu lub DX, thiab tag nrho-ntev sensor FX. Tej encoding tseem nyob ua ib ke hnub no. Nws yog siv los ntawm ntau lwm tuam txhab uas muag, nyob rau hauv tas li ntawd mus Nikon.

Manufacturers ntawm cov koob yees duab nrog cov qoob loo zoo tshaj, siv dab tsi cheeb tsam ntawm lawv sensors poob los ntawm ntau tshaj ib nrab. Qhov no ua rau cov nyiaj khaws tseg nyob rau hauv qhov siv thiab ua haib thiab kim optics. Manufacturers pib tsim loj qhov ntau ntawm cov koob yees duab uas muaj nyob rau ntau yam ntawm kev pab txog.