"Soapboxes" yog cov koob yees duab compact nrog lub lens built-in, lawv muaj me me thiab qhov hnyav, thiab txhua yam kev tsis tua yeej raug kho lossis muaj ib qhov txheej tsawg ntawm cov chaw.
Yuav lub koob yees duab "xab npum", koj yuav tsum to taub meej hais tias tag nrho cov advertising slogans txog unsurpassed zoo ntawm daim duab - nws yog ib tug tswvyim hais ua dabneeg. Tsis muaj lub siab tsis muaj suab nrov, nrog kev zoo thiab qhov tseeb ntawm kev hais lus tsis tuaj yeem nyob ntawm no. Tshwj xeeb tshaj yog thaum tua hauv tsev.
Thiab tseem, qee zaum ib lub koob yees duab compact txaus. Yog tias koj lub hom phiaj - yog koj tsev neeg cov duab tsis muaj lub siab nyiam rau kev sib daj sib sib zog nqus xim thiab muaj kev sib tw, koj tuaj yeem tuaj tos tau "lub npuaj npog".
Yuav ua li cas xaiv lub koob yees duab "xab npum"?
Ib qho tseem ceeb ntawm kev xaiv yog qhov loj ntawm lub sensor (matrix) ntawm lub koob yees duab. Qhov ntau nws yog, qhov zoo dua daim duab yuav lav ib "soapbox". Qhov kev hu ua artistic zoo ntawm cov duab uas tau tshwm sim tsis muaj suab nrov nrov, kev sib kis ntawm hues, zoo thaum thaum tsis muaj flash.
"Xab npum" koob yees duab nrog ib lub cim zoo ntawm 1 nti los yog ntau tshaj muab cov duab zoo. Cov koob yees duab nrog cov loj matrices tuaj yeem hu ua compact.
Cov neeg sawv cev zoo ntawm tsev neeg "inch" - koob yees duab Canon, Sony Cybershot tsev neeg RX, Panasonic. Nyob rau hauv cov khoom siv no, ib qho zoo matrix, ib lub lens zoo thiab ib qho loj me yog cov khoom sib txig sib luag. Qhov tseeb, koj yuav tsum tau them tus nqi ntau heev rau qhov no, tab sis qhov kev xaiv no yuav zoo tshaj yog tias koj xav tau lub koob yees duab zoo nrog tsis muaj kev sib hloov hauv lub tshuab uas haum rau lub hnab tsho ntawm lub tsho mis thiab tsis ua phem rau kev ua tsis ncaj.
Nyob rau hauv ob qhov chaw nyob rau hauv qhov tseem ceeb - lub optics ntawm lub koob yees duab, uas yog, nws cov lens. Qhov loj nws yog nyob rau hauv lub cheeb, qhov zoo dua lub koob yees duab yuav xav nyob rau hauv tsawg lub teeb. Cov koob yees duab "xab npum" zoo nrog opt optics muaj kev pom muaj lub lens nrog lub nruas focal ntev thiab lub tswv yim ntawm kev pom tseeb los yog tsom ntsoov ua.
Tsis muaj tsawg tus parameter ntawm lub koob yees duab yog lub lens ceev ntawm lub lens. Nws qhia txog lub peev xwm ntawm lub lens xa tawm lub teeb thiab qhia nyob rau hauv qhov ratio ntawm lub focal ntev ntawm lub lens mus rau lub cheeb ntawm nws cov lens pem hauv ntej.
Thaum kho qhov sib txawv ntawm qhov diaphragm, peb kho cov teeb ntawm lub teeb rau hauv daim diaphragm. Qhov tob ntawm daim teb yog nyob ntawm qhov no. Nyob rau hauv cov ntaub ntawv ntawm tsev photography, ntau qhov tob ntawm daim teb yog zoo, nkaum yuam kev nyob rau hauv tsom thiab focusing.
Hmoov tsis, nyob rau hauv "xab npum" tus neeg siv tsis tuaj yeem teev qhov tseem ceeb ntawm nws tus kheej, thiab ib tug tsuas cia siab rau kev nqis tes thiab cov kev pab cuam uas xaiv qhov ceev qhov ceev kom qhov no los yog hom kev tua ntawd.
Txiav txim siab tseem ceeb nyob rau hauv kev xaiv ntawm cov cuab yeej shooting khoom yog cov khoom ntawm tsim lub hom phiaj lens. Hauv khw muag khoom pheej yig, cov khoom siv kho qhov muag, thaum tseem ua "whale" optics rau pheej yig SLR koob yees duab . Qhov tsis zoo ntawm cov khoom siv no yog qhov hloov hauv qhov ntsuas ntawm qhov ntsuas kub, qhov tsis pom kev ntawm cov yam ntxwv kho qhov muag vim qhov tsis muaj zog.
Nyob rau hauv lub Frost los yog nyob rau hauv lub tshav kub, lub plag expands, lub geometry ntawm lub lo lo ntsiab muag hloov, thiab dhau lub sij hawm lawv saum npoo kuj ua turbid. Tsis tas li ntawd, yas optics muaj cov yam ntxwv zoo tsis txaus, tshwj xeeb - kev daws teeb meem.
Iav rau optics kuj muaj ntau yam zoo. Tsis tshua muaj iav muaj npuas, tawg thiab lwm yam khoom me me. Ntawm chav kawm, xws li phenomena tsawg tsawg thiab tsuas yog nyob rau hauv me ntsis-paub tuam txab. Feem ntau, nws tus kheej saibxyuas hom ntxiv zoo iav lens nrog anti-reflective lo, uas ib txhij nce nws tsis kam mus rau mechanical kev puas tsuaj.