Ladislav Soukup Kev ua tsov ua rog megapixel rau cov koob yees duab compact twb yog ib qho kev coj ua, tab sis cov xov tooj ntawm tes tsis tau koom nrog ntau. Feem ntau cov xov tooj ntawm tes nyob qis qis ntawm megapixels thiab xaus li ntawm 8 Mpix. Tab sis dab tsi yog qhov tseem ceeb rau cov duab zoo? Puas yog 41 Mpix xav tau tiag tiag?
Sensors
Hom thiab kev daws teeb meem ntawm lub sensor yog qhov tseem ceeb, tab sis tsuas yog rau qee yam. Qhov zoo ntawm qhov kho qhov muag kuj ua lub luag haujlwm loj, uas yog qhov teeb meem loj tshaj plaws nrog cov xov tooj ntawm tes. Yog tias cov optics tsis zoo, txawm tias qhov kev daws teeb meem ntawm 100 Mpix yuav tsis cawm koj. Ntawm qhov tod tes, tom qab qhov zoo tshaj plaws optics, lub sensor nrog kev daws teeb meem siab dua tuaj yeem qhia tawm. Lwm qhov taw qhia tseem ceeb dua li kev daws teeb meem yog hom sensor nrog rau kev tsim kho ntawm tus kheej photocells.
Ib qho kev nthuav technology kuj yog Back-illuminated sensor, uas Apple tau siv txij li lub iPhone 4. Qhov zoo dua yog tias hom sensor no tuaj yeem ntes kwv yees li 90% ntawm photons, tsis yog li 60% ib txwm muaj rau CMOS sensor classic. Qhov no zoo heev txo cov suab nrov digital uas CMOS sensors feem ntau raug kev txom nyem los ntawm. Uas yog lwm qhov tseem ceeb qhia txog qhov zoo. Hauv cov teeb pom kev tsis zoo, lub suab nrov tshwm sai heev hauv daim duab thiab tuaj yeem ua rau qhov zoo ntawm daim duab zoo heev. Thiab ntau megapixels nyob rau hauv ib qho chaw me me (los yog qhov me me ntawm lub xov tooj ntawm tes), lub suab nrov dua pom, uas tseem yog qhov laj thawj tseem ceeb vim li cas photomobiles feem ntau lo rau hauv av hauv kev ua tsov ua rog megapixel, thiab Apple daig rau 4 Mpix nrog iPhone. 5 thiab tsuas yog nrog iPhone 4S tau hloov mus rau 8 Mpix, qhov twg iPhone 5 tseem nyob.
Cia peb ntse
Lub peev xwm ntawm lub optics tsom kuj tseem ceeb heev ... nyob rau hauv lub yav dhau los nyob deb (iPhone 3G) lub lens twb tsau thiab lub tsom xam tau tsau nyob rau hauv ib tug tshwj xeeb kev ncua deb - feem ntau nyob rau hauv lub hyperfocal nrug (piv txwv li qhov tob ntawm teb xaus raws nraim ntawm infinity thiab pib ze rau lub koob yees duab li sai tau). Niaj hnub no, feem coob ntawm cov koob yees duab xov tooj tau hloov mus rau optics muaj peev xwm tsom, Apple tau ua li ntawd nrog iPhone 3GS nrog iOS 4.
Lub koob yees duab digital
Lwm qhov tseem ceeb yog cov duab processor, uas saib xyuas kev txhais cov ntaub ntawv los ntawm lub sensor rau hauv cov duab tshwm sim. Cov tswv ntawm cov koob yees duab SLR yog tej zaum twb paub txog cov hom ntawv RAW, uas "bypasses" cov txheej txheem no thiab hloov nws tsuas yog nrog software ntawm lub computer (tab sis tam sim no kuj ntawm cov ntsiav tshuaj). Cov duab processor muaj lub luag haujlwm ntawm ntau yam - tshem tawm suab nrov (software), sib npaug dawb (kom cov xim tones sib haum rau qhov tseeb - nws nyob ntawm lub teeb pom kev hauv daim duab), ua si nrog lub suab ntawm cov xim hauv daim duab (ntsuab. thiab xiav saturation yog ntxiv rau toj roob hauv pes, thiab lwm yam ...), kho qhov sib piv ntawm daim duab thiab lwm yam kev hloov me me.
Tseem muaj cov sensors uas muaj raws nraim li 40 Mpix thiab siv "trick" los txo cov suab nrov... Txhua pixel yog interpolated los ntawm ntau lub photocells (pixels ntawm lub sensor) thiab cov duab processor sim ntaus cov xim thiab siv rau qhov pixel ntawd. . Qhov no feem ntau ua haujlwm. Apple tseem tsis tau mus txog cov txheej txheem zoo sib xws, thiab yog li nws tseem nyob ntawm cov zoo dua. Lwm nthuav tswv yim tshwm sim tsis ntev los no (thiab tseem tsis tau siv nyob rau hauv kev xyaum nrog ib tug photomobile) - Dual ISO. Qhov no txhais tau hais tias ib nrab ntawm lub sensor scans nrog siab tshaj plaws rhiab heev thiab lwm ib nrab nrog yam tsawg kawg nkaus rhiab heev, thiab dua qhov tshwm sim pixel yog interpolated siv cov duab processor - txoj kev no tej zaum qhov zoo tshaj plaws suab nrov suppression tau kom deb li deb.
zoom
Lub zoom kuj yog qhov ua tau zoo, tab sis hmoov tsis nws tsis yog kho qhov muag ntawm lub xov tooj ntawm tes, tab sis feem ntau tsuas yog digital. Optical zoom yog pom tseeb zoo dua - tsis muaj duab degradation. Digital zoom ua haujlwm zoo li cov duab zoo tib yam cropping, piv txwv li cov npoo yog cropped thiab cov duab ces zoo li loj; Hmoov tsis zoo ntawm tus nqi. Qee lub tuam txhab mus rau txoj kev ntawm 40 Mpix sensors, uas cov qoob loo digital yooj yim dua - muaj ntau yam los ntawm nws. Cov duab uas tau tshwm sim yog tom qab ntawd hloov los ntawm kev daws teeb meem siab mus rau qib ntawm kwv yees li 8 Mpix.
[do action="citation"] Daim duab zoo tsis yog tsim los ntawm lub koob yees duab, tab sis los ntawm tus kws yees duab.[/do]
Txawm hais tias nyob rau hauv rooj plaub no tsis muaj kev daws teeb meem loj (tom qab txuag, daim duab ib txwm tsawg dua li cov ntsiab lus ntawm lub sensor), yuav muaj qhov degradation ntawm qib sensor, qhov twg cov ntsiab lus ntawm tus kheej yog me dua thiab yog li tsawg dua. rhiab heev rau lub teeb, uas hmoov tsis txhais tau tias ntau lub suab nrov. Tab sis feem ntau nws tsis yog txoj kev phem thiab nws ua rau kev nkag siab. Peb mam li pom yog tias Apple ua raws li kev cai nrog lub iPhone tshiab. Hmoov zoo rau lub iPhone, muaj ob peb lub lens tshem tau uas tuaj yeem ntxiv qhov muag pom nrog qhov cuam tshuam tsawg rau qhov zoo - tau kawg, ntau nyob ntawm qhov zoo ntawm cov khoom siv kho qhov muag.
ci ntsa iab
Rau kev thaij duab hauv qhov tsaus ntuj, feem ntau cov xov tooj ntawm tes niaj hnub no twb siv "flash", piv txwv li lub teeb dawb LED, lossis xenon flash. Feem ntau nws ua haujlwm thiab pab, tab sis hauv kev yees duab feem ntau, on-axis flash yog suav tias yog qhov phem tshaj plaws. Ntawm qhov tod tes, kev siv lub flash sab nraud (loj thiab hnyav dua li lub xov tooj ntawm tes) yog qhov tsis zoo, yog li off-axis flash yuav nyob twj ywm ntawm cov kws yees duab ib nrab thiab cov kws tshaj lij DSLR rau lub sijhawm ntev. Tab sis qhov ntawd tsis tau txhais hais tias lub iPhone tsis tuaj yeem siv rau kev yees duab portrait ntawm qib kev tshaj lij Tom qab tag nrho, ua tib zoo saib koj tus kheej ntawm kev yees duab nrog iPhone 3GS.
[youtube id=TOoGjtSy7xY width=”600″ height=”350″]
Duab zoo
Uas coj peb mus rau qhov teeb meem dav dav: "Kuv tsis tuaj yeem thaij duab zoo li tsis muaj lub koob yees duab kim." Koj ua tau. Daim duab zoo tsis yog tsim los ntawm lub koob yees duab, tab sis los ntawm tus kws yees duab. Lub koob yees duab SLR digital nrog lub lens kim kim yuav ib txwm zoo dua li lub xov tooj ntawm tes, tab sis tsuas yog nyob hauv txhais tes ntawm tus kws yees duab paub txog. Tus kws yees duab zoo yuav thaij duab zoo dua nrog lub xov tooj ntawm tes dua li cov kws yees duab tsis yog feem ntau nrog lub koob yees duab SLR kim - feem ntau kuj los ntawm kev pom.
Peb faib cov duab
Tsis tas li ntawd, ib qho txiaj ntsig zoo ntawm cov xov tooj smartphones thiab iOS feem ntau yog cov ntawv thov ntau rau kev kho cov duab thiab lawv cov kev sib koom yooj yim thiab ceev, uas iOS nws tus kheej yog niaj hnub txhim kho thiab nthuav dav. Qhov tshwm sim yog tias daim duab los ntawm iPhone tau npaj thiab sib koom ob peb feeb, thaum txoj kev taug kev los ntawm SLR lub koob yees duab mus rau kev sib raug zoo siv sijhawm ob peb teev (nrog rau kev taug kev hauv tsev thiab kev ua haujlwm). Cov txiaj ntsig feem ntau zoo sib xws.
Lub built-in app hauv iOS no muaj peev xwm heev ntawm nws tus kheej. Rau cov neeg siv xav tau ntau dua, muaj dua ib pab pawg loj ntawm cov ntawv thov tsom rau cov neeg siv siab dua nrog ntau yam kev xaiv. Daim ntawv thov muaj tej zaum yuav muaj feem ntau PureShot, uas tshuaj xyuas peb tab tom npaj rau koj. Peb mam li muaj ib txheej thib ob ntawm daim ntawv thov muaj rau kev yees duab editing. Ib pawg cais yog cov ntawv thov uas txhawb nqa ob qho tib si thaij duab thiab kho tom qab - piv txwv li, zoo heev Yees +.
Tej zaum qhov kev txwv nkaus xwb ntawm iPhone yog tsom… uas yog, muaj peev xwm tsom mus rau manually. Muaj cov duab thaum lwm yam zoo heev autofocus tsis ua hauj lwm thiab nws yog ces mus txog rau cov txuj ci ntawm tus kws yees duab mus rau "bypass" cov kev txwv thiab yees duab. Yog lawm, kuv yuav thaij duab zoo dua nrog SLR thiab lub lens macro, nrog lub suab nrov tsawg, tab sis thaum muab piv rau iPhone thiab lub koob yees duab "tsis tu ncua" compact, cov txiaj ntsig tau nyob ze heev, thiab iPhone feem ntau yeej vim muaj peev xwm. txheej txheem thiab muab cov duab tam sim ntawd.
Tus kheej, kuv xav tias nws yog ntau dhau los sib piv tus kws yees duab nrog iPhone VS tus neeg siv tsis paub nrog lub koob yees duab SLR tshaj lij. Yog tias ib tug neeg yuav ib tus kws tshaj lij SLR nrog lub lens zoo, nws tsis yog tus pib, tab sis tsawg kawg. ib tug amateur uas yuav muaj 100x cov duab zoo dua li tus kws yees duab nrog lub iPhone. Nws tsis yog rau tsis muaj dab tsi uas kuv tau tawm tsam hauv ib qho ntawm cov kws yees duab cov ntawv xov xwm uas lawv yuav tsum siv iPhones es tsis txhob siv SLRs thiab lawv txaj muag ntawm lawv txoj haujlwm. Txhua tus neeg uas tau pom qhov kev sib piv ntawm cov duab los ntawm daim ntawv qhia iP VS SLR paub zoo sai npaum li cas qhov zoo poob. Hauv daim vis dis aus hauv tsab xov xwm, tus kws yees duab tau txais iPhone rau kev yees duab, tab sis nws tsis txwv tsis pub siv lub studio cov khoom kim heev, suav nrog tus qauv zoo nkauj :D Kuv xav tias nws yuav ua li cas yog tias nws tsuas yog thaij duab hmo ntuj. nyob rau hauv lub hli thiab hnub qub - zoo, qhov ntawd yuav yog qhov tshwm sim loj heev ;-)
Nyob rau hauv phau ntawv journal, nws tsis yog cov kws yees duab tab sis cov neeg kho uas tau cem lawv tias yuav tsum tau thaij duab nrog iPhone vim tus kws yees duab pov tseg cov ntawv xov xwm. Kuv paub ntau tus amateurs uas tau yuav cov koob yees duab SLR kim heev thiab lawv cov duab yog ob peb chav kawm phem dua cov uas coj nrog iPhone.
Kuv tseem sawv ntawm kuv tus kheej, tias qhov kev sib piv yog absurd thiab kuv tsuas yog lo rau qhov kawg. Ib qho lus hais hauv qhov no: Tus uas xav ntaus tus dev yeej yuav pom ib tug pas.
Lub lens kuv siv yog tua cov kis las, qhov twg tus kws yees duab sawv ntawm qhov deb ntau dua thiab cov teeb pom kev zoo tsis zoo -> iP hauv tes ntawm tus kws tshaj lij VS Nikon D600 hauv tes ntawm tus neeg nyiam ua haujlwm nrog kev sib tw tua.
Qhov txawv? Abyssal nyob rau hauv kev haum xeeb ntawm cov amateur. Hul tuaj yeem nrhiav pom ;-)
Yog li ntawd, nws yog me ntsis saum toj, tab sis tsis ntau dhau. Kuv tau ntsib ntau tus neeg nrog cov cuab yeej yees duab rau 100000 thiab ntau dua, tab sis tsis muaj kev paub me ntsis. Yog, tsis muaj ntau ntawm lawv (yog tias kuv tsis suav cov neeg ncig tebchaws Nyij Pooj), tab sis lawv nyob ntawd.
Txwv tsis pub, tus kws yees duab yees duab yuav tsis tua ntau yam nrog lub koob yees duab SLR yam tsis muaj lub teeb studio.. paub tias ntau qhov kev yees duab sab nraum zoov tuaj yeem ua tiav nrog iPhone thiab vim li ntawd nws yuav tsis pom zoo li ntawd ... Yog. , tus kws tshaj lij yuav tsis thaij duab ua haujlwm them nyiaj nrog lub xov tooj ntawm tes (yog tias tsis them nyiaj los ntawm lub tuam txhab xov tooj), tab sis feem ntau nws muaj peev xwm thiab ntau tus kws yees duab hauv lawv lub sijhawm dawb ua pov thawj tias nws muaj peev xwm :)
Tab sis nws yog ntau ntxiv txog qhov tseeb tias: "Lub koob yees duab zoo tshaj yog qhov kuv muaj nrog kuv" - lub koob yees duab SLR hauv tsev yog qhov tseem ceeb rau kuv ... thiab kuv muaj kuv lub xov tooj ntawm tes nrog kuv yuav luag txhua lub sijhawm :)
Nws zoo heev uas tau hnov cov lus no, piv txwv li, los ntawm tus kws yees duab uas, nyob rau hauv qhov kawg, xav yuav Canon 5D Mark III es tsis txhob ntawm Mark II, uas nws xub muaj.
Demagoguery mus rau nth :-) Ntawm no dua ib tug neeg sim qhia peb tias iPhone duab sib npaug rau cov duab los ntawm lub koob yees duab yees duab. lub xov tooj ntawm tes yuav tsis muaj qhov optics, txoj kab uas hla ntawm lub lens thiab qhov loj ntawm nti raws li lub koob yees duab muaj. TSIS MUAJ.
Thiab los ntawm ib daim ntawv thov lub hom phiaj mus rau ib qho kev xaiv ntawm cov nyhuv ceev, kev kho ntawm lub PC yog txawm tias tawm. Cov kab lus uas ua rau kuv nyuaj siab tshaj plaws yog kab lus no: "Cov txiaj ntsig feem ntau zoo ib yam." LOL, yog li yog tias koj muaj ntau yam haujlwm hauv koj txhais tes thiab lub taub hau, kho rau hauv computer yuav tsis txuag nws, qhov tseeb. thiab txawm tias cov nyhuv vintage super-txias los ntawm qee qhov app ruam yuav tsis txuag nws. nws yuav yog ib daim duab xwb. i.e. ib qho app zoo li Lub Koob Yees Duab + yuav tsis muab piv rau Aperture lossis Photoshop.
Tsuas yog. Nws tsis yog tib tus neeg ua si, nws tsis yog tib pab koomtes. Qhov no yog kev ua kis las sib txawv kiag li! Qhov tsuas yog qhov kuv paub yog tias rau kev yees duab zais cia, qhov twg kuv yuav raug ncaws tawm nrog lub koob yees duab SLR, kuv tsis tuaj yeem nqa mus rau lub puam, thiab lwm yam, lossis tsuas yog rau qhov xwm txheej ceev uas kuv xav tau sai sai rau ntawm lub web. kawg album, tab sis kuv yuav xav tau los ntawm lub koob yees duab SLR, Kuv yuav tsis tham txog qhov ntawd.
Puas yog koj tsis tso cai rau lub puam nrog lub koob yees duab SLR? Kuv yuav tsum tau nyob hauv ntiaj teb ob peb xyoos ua ntej kuv ntsib qhov kev txwv no. Rau kuv, daim duab xwm txheej yog qhov no -> thaij duab ntawm lub qhov rooj tsheb tawg, yog, lub iP tau txais txiaj ntsig zoo rau lub hom phiaj no.
Yog lawm. Thiab 640 KB ntawm lub cim xeeb yuav tsum txaus rau txhua tus ... ;-)
Lub iPhone 5 thiab feem ntau dlej xov tooj ntawm tes muaj peev xwm yeej ntes tau tej yam zoo sib xws nyob rau hauv ob txhais tes ntawm amateur li dog dig compacts. Tus neeg siv zoo tib yam feem ntau tsis tua hauv RAW, tsis ua si nrog aperture thiab qhov tob ntawm qhov chaw, thiab qhov kev daws teeb meem thiab suab nrov feem ntau txaus rau cov hom phiaj xws li cov neeg siv xav tau (sib koom hauv FB, ob peb emails, qee qhov kev nthuav qhia hauv web, qee qhov. daim duab me me). Yog li, txawm hais tias nws zoo rau masturbate tshaj qhov zoo ntawm SLR, qhov tseeb yog tias rau xws li "tsev siv los ntawm ib tus neeg siv niaj hnub" lub xov tooj uas siv cov duab zoo nkauj yog lwm txoj hauv kev txaus. Qhov tseeb, qhov zoo ntawm cov xov tooj niaj hnub no zoo dua (yog tias kuv tsis quav ntsej qhov tob ntawm qhov chaw) dua li, piv txwv li, los ntawm cov koob yees duab kev tshaj lij thaum lub sijhawm Leica ua rau lawv nto moo, thiab txawm tias peb tseem qhuas cov duab. los ntawm cov tshuab ntawd. Kuv hais qhov no nrog rau tag nrho lub luag haujlwm thiab raws li ib tug neeg uas thaij duab nrog lawv.
Nrog lub koob yees duab loj, ib qho tau txais cov duab zoo, tab sis kev txi ntau qhov tseem ceeb rau ntau tus neeg - kev npaj, muaj thiab yooj yim ntawm kev siv. Thiab qhov kev xaiv tsis yog ntawm kev muaj daim duab zoo dua thiab daim duab ntawm cov khoom siv tsis zoo, tab sis ntawm kev muaj duab lossis tsis thaij duab txhua.
Txawm hais tias kuv muaj Hasselblads thiab lwm hom nruab nrab hauv tsev, Leicas, MarkIIs nrog ib pawg ntawm L lo ntsiab muag, Kuv nqa cov duab feem ntau nrog lub iPhone tsuas yog vim nws nyob ntawm tes thaum kuv xav tau ... ib txwm ... tsis yog thaum twg. Kuv xav ua ntej tias kuv yuav thaij duab TAM SIM NO. Qhov zoo ntawm daim duab yog ces tsuas yog teeb meem ntawm kev yees duab thiab xyaum me ntsis.
Yog koj hais yog lawm. ob kab lus no muaj me ntsis ntawm kuv qhov kev xav. te ua raws cai thiab npaj txhij. thiab yog, virtuoso tuaj yeem ua si txawm tias qhov ntsuas tsis zoo. Tsis ntseeg txog nws.
Koj sau txog kev txawj ntse nrog rau cov duab zoo thiab tom qab ntawd koj muaj Mark II, uas yog qhov tsis sib haum xeeb.
Tej zaum koj yuav ua xua rau cov khoom zoo sib xws.
> "Ntawm no dua ib tug neeg sim qhia peb tias cov duab iPhone sib npaug rau cov duab los ntawm lub koob yees duab yees duab".
Kuv nyeem tsab xov xwm tag nrho thiab tsis muaj dab tsi los ntawm nws. Hauv kuv lub tswv yim, tus sau tau sau cov ntsiab lus zoo heev tias yuav ua li cas nrog lub xov tooj ntawm tes thiab nws qhov zoo thiab qhov tsis zoo yog dab tsi.
Kuv xav tias txhua tus neeg tsim nyog yuav nkag siab tias lub xov tooj ntawm tes tsis tuaj yeem muab piv rau DSLR. Tab sis cov xov tooj ntawm tes niaj hnub no twb zoo txaus los thaij duab zoo nrog lawv - rau kev siv hauv tsev, mus ncig ua si ... Thiab kuv pom zoo tag nrho cov kev xav tias daim duab zoo yog feem ntau yog los ntawm tus kws yees duab.
lub koob yees duab zoo tshaj plaws yog ib qho uas koj muaj nrog koj thaum koj xav tau yees duab ... nws feem ntau tsis yog dslr ;o)
Qhov tseem ceeb tshaj plaws rau kev ua haujlwm zoo ntawm daim duab yog lub cev loj ntawm cov nti ua ke nrog cov khoom siv kho qhov muag zoo. Tus naj npawb ntawm pixels yuav tsum yog proportionate rau lub cev loj ntawm lub nti.