Phau Ntawv Qhia Txog Lub Koob Yees Duab Digital ISO Settings
Hauv kev thaij duab digital, ISO yog ib qho ntawm cov ncej tseem ceeb ntawm daim duab peb sab, nrog rau qhov aperture thiab shutter speed. Tag nrho peb yam txiav txim siab seb daim duab yuav ci lossis tsaus npaum li cas. Txawm li cas los xij, ISO feem ntau yog qhov chaw "txuag txoj sia" thaum muaj teeb pom kev nyuaj - piv txwv li, thaum thaij duab hauv chav tsaus ntuj, thaum hmo ntuj, lossis thaum koj xav kom lub shutter speed siab kom tiv thaiv kev tsis meej. Tsab xov xwm no tham txog kev teeb tsa ISO ntawm tes ntawm cov koob yees duab digital: lawv yog dab tsi, lawv ua haujlwm li cas, thaum twg yuav tsum tsa lossis txo lawv, thiab cov tswv yim ua tau zoo rau kev ua kom cov duab ntse thiab tsis muaj suab nrov ntau dhau.
ISO ntawm lub koob yees duab digital yog dab tsi?
ISO ntawm lub koob yees duab digital yog hais txog qhov rhiab heev ntawm lub sensor rau lub teeb. Hauv lub sijhawm ua yeeb yaj kiab, ISO (lossis ASA) qhia tias zaj duab xis rhiab heev npaum li cas rau lub teeb. Hauv cov koob yees duab digital, lub tswv yim no txhais tau tias lub sensor lub teeb liab nce. ISO siab dua, lub sensor rhiab heev dua, ua rau cov duab ci dua nyob rau hauv tib lub teeb pom kev zoo.
Txawm li cas los xij, muaj ib qho kev pauv pauv tseem ceeb: kev nce qhov ISO feem ntau ua rau muaj suab nrov (digital grain) thiab tuaj yeem txo cov ntsiab lus, xim, thiab dynamic range. Yog li ntawd, kev xaiv ISO tes tsis yog tsuas yog ua kom cov duab ci dua xwb, tab sis yog hais txog kev tswj hwm qhov sib npaug ntawm qhov ci thiab qhov zoo ntawm daim duab.
Nkag Siab Txog ISO Yooj Yim (Base ISO)
Txhua lub koob yees duab muaj "ISO yooj yim" - feem ntau yog ISO 100 lossis ISO 64 ntawm qee lub koob yees duab - uas feem ntau muab cov duab zoo tshaj plaws: suab nrov qis tshaj plaws, cov ntsiab lus siab tshaj plaws, thiab qhov dav tshaj plaws. Qhov zoo tshaj plaws, cov kws thaij duab xav kom ua raws li ISO qis thaum twg ua tau.
Txawm li cas los xij, qhov tseeb ntawm kev thaij duab feem ntau xav tau kev sib haum xeeb. Yog tias koj thaij duab hauv chav tsaus ntuj uas tsis muaj lub tripod, kev siv ISO qis tuaj yeem ua rau lub shutter speed qeeb dhau, ua rau cov duab tsis meej vim tes co lossis cov khoom txav mus los. Qhov ntawd yog qhov uas ISO manually los hauv: koj txiav txim siab qhov zoo uas tsim nyog rau daim duab ntse.
Kev Sib Raug Zoo Ntawm ISO thiab Aperture thiab Shutter Speed
ISO tsis yog ib leeg xwb. Yog koj hloov ISO, feem ntau koj tuaj yeem them nrog lub qhov (aperture) lossis lub qhov ceev ntawm lub koob yees duab (shutter speed) kom tswj tau qhov kaj.
- ISO nce ntxiv → daim duab ci dua, koj tuaj yeem siv qhov ceev ntawm lub koob yees duab sai dua lossis lub qhov me dua.
– Qis dua ISO → daim duab tsaus dua, koj xav tau qhov ceev ntawm lub shutter qeeb dua lossis qhov qhib loj dua.
Piv txwv li, thaum thaij duab hauv tsev: koj xav tau qhov ceev ntawm lub shutter ntawm 1/250 kom khov qhov kev txav mus los, tab sis tsis muaj lub teeb txaus. Koj tuaj yeem qhib lub qhov aperture rau f/2.8, tab sis yog tias nws tseem tsaus ntuj, nce ISO ntawm 400 mus rau 1600 tuaj yeem yog ib qho kev daws teeb meem los tswj qhov kev pom kev zoo.
Thaum Twg Koj Yuav Tsum Siv Phau Ntawv ISO?
Muaj ntau lub koob yees duab muab Auto ISO, tab sis manual ISO muab kev tswj hwm zoo dua, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej hauv qab no:
1. Teeb pom kev ruaj khov
Piv txwv li, thaum thaij duab hauv studio, thaij duab khoom, lossis sab nraum zoov uas lub teeb tsis hloov pauv ntau, koj tuaj yeem teeb tsa ISO qis rau qhov zoo tshaj plaws.
2. Kev tswj xyuas zoo ntawm daim duab
Thaum koj xav kom suab nrov tsawg kawg nkaus, qhov kev siv tes ISO ua rau muaj txiaj ntsig zoo dua li Auto ISO, uas qee zaum "dhia" mus rau qhov ISO siab.
3. Kev thaij duab hmo ntuj lossis lub teeb qis nrog qee qhov kev txwv suab nrov
Rau cov duab thaij hmo ntuj, koj yuav txais me ntsis suab nrov ntawm ISO 3200, tab sis tsis txais ISO 12800. Yog siv phau ntawv, koj tuaj yeem teeb tsa qhov txwv ntawd thiab kho qhov shutter/aperture raws li qhov xav tau.
4. Panning los yog ntev exposure
Thaum thaij duab ntev (dej tsaws tsag du, teeb ntawm lub tsheb), koj xav kom ISO qis li qis tau kom koj tuav tau lub shutter ntev yam tsis muaj kev ci ntau dhau thiab tswj tau suab nrov.
Qhov Cuam Tshuam ntawm ISO Siab: Suab Nrov, Cov Ntaub Ntawv, thiab Dynamic Range
ISO siab ua rau muaj ntau qhov tshwm sim loj:
- Cov xim tsaus ntuj: cov xim tsaus ntuj zoo li cov xim av daj.
- Suab nrov Chroma: cov xim tsis zoo (liab/ntsuab/xiav), tshwj xeeb tshaj yog nyob rau hauv thaj chaw tsaus ntuj.
- Kev poob ntawm cov ntsiab lus: cov qauv zoo tuaj yeem "rhuav tshem" los ntawm kev txo suab nrov.
- Qhov ntau yam dynamic nqaim dua: qhov tseem ceeb yooj yim dua "tshuab tawm" thiab cov duab ntxoov ntxoo yooj yim dua.
Txawm li cas los xij, cov koob yees duab niaj hnub no zoo dua qub. ISO 3200 lossis 6400 ntawm cov koob yees duab tshiab feem ntau tseem siv tau, tshwj xeeb yog tias koj thaij duab hauv hom ntawv RAW thiab ua kom zoo.
Txoj Kev Npaj Siv Tau Zoo Rau Kev Teeb Tsa Phau Ntawv ISO
Nov yog ib txoj hauv kev yooj yim thiab siv tau zoo thaum xaiv cov ISO manually:
1. Pib ntawm qhov ISO qis tshaj plaws.
Yog tias muaj teeb pom kev txaus los yog koj siv lub tripod, teeb tsa ISO rau qhov ISO pib (100/64). Qhov no muab cov txiaj ntsig huv tshaj plaws.
2. Txheeb xyuas qhov ceev tsawg kawg nkaus ntawm lub shutter
Yuav kom tsis txhob muaj qhov tsis meej ntawm kev tuav tes, txoj cai dav dav yog: qhov ceev ceev tsawg kawg nkaus yog li 1/(qhov ntev ntawm lub lens).
Piv txwv li: 50mm lens → yam tsawg kawg nkaus 1/50 vib nas this (muaj kev nyab xeeb dua 1/100).
Yog tias tus neeg ntawd txav mus los (menyuam yaus me, kis las), nws yuav tsum tau nrawm dua, piv txwv li 1/250–1/1000.
Yog tias qhov ceev ntawm lub shutter ceev dhau rau qhov teeb pom kev zoo, nce qhov ISO kom txog thaum tau txais qhov raug.
3. Siv qhov aperture raws li qhov xav tau muaj tswv yim
Rau cov duab portrait, koj xaiv tau f/1.8–f/2.8 rau bokeh. Rau cov toj roob hauv pes, tej zaum f/8–f/11 rau qhov ntse tag nrho. Thaum xaiv qhov aperture lawm, ISO yuav dhau los ua lub cuab yeej sib npaug los tswj qhov ceev ntawm lub shutter kom ruaj ntseg.
4. Soj ntsuam cov histogram thiab cov ntsiab lus tseem ceeb
Tsis txhob cia siab rau qhov saib ua ntej ntawm qhov screen xwb. Xyuas cov histogram kom paub tseeb tias tsis muaj ntau qhov chaw uas raug tshav ntau dhau. Ntawm qee lub koob yees duab, qhov "ceeb toom qhov tseem ceeb" (blinkies) pab nrhiav cov chaw uas tsis muaj cov ntsiab lus.
5. Zoo dua kom kaj me ntsis dua li tsaus dhau (nyob rau hauv qhov txwv)
Feem ntau, cov duab uas tsaus ntuj dhau thiab tom qab ntawd "nqa" thaum kho yuav ua rau muaj suab nrov ntau dua, tshwj xeeb tshaj yog nyob rau hauv qhov ntxoov ntxoo. Yog li ntawd, tsom rau qhov kev pom zoo txaus (tsis txhob hlawv cov ntsiab lus tseem ceeb). Kev thaij duab RAW ua rau koj muaj kev ywj pheej ntau dua hauv kev kho qhov pom thiab suab nrov.
Kev Siv ISO Los Ntawm Tes Rau Ntau Yam Kev Thaij Duab
1. Sab nraum zoov thaum nruab hnub
– ISO: 100–200
- Qhov ceev ntawm lub Shutter feem ntau yooj yim rau kev ceev
- Ua kom pom tseeb rau qhov aperture raws li qhov tob ntawm daim teb xav tau
2. Sab hauv tsev tsis muaj lub teeb ci ntsa iab
– ISO: 800–3200 (nyob ntawm lub koob yees duab thiab lub teeb)
- Xaiv qhov ceev ntawm lub shutter uas muaj kev nyab xeeb (yam tsawg kawg nkaus 1/100 rau tib neeg, ceev dua yog tias txav mus los)
- Qhov qhib dav pab tau (f/1.8–f/2.8)
3. Kev thaij duab hmo ntuj ntawm txoj kev
– ISO: 1600–6400
- Qhov ceev shutter tsawg kawg yog 1/125 kom lub sijhawm ntawd tsis pom tseeb
- Xav txog suab nrov ua ib qho "style" yog tias tsim nyog, tab sis khaws qhov tseem ceeb rau.
4. Kev hais kwv txhiaj lossis theem
– ISO: 3200–12800 (feem ntau xav tau)
- Kev ceev ntawm lub Shutter yog 1/250 lossis sai dua rau kev txav mus los
- Xim teeb pom kev zoo heev; RAW raug pom zoo kom kho qhov sib npaug dawb.
5. Kev siv lub teeb ntev (lub nroog hmo ntuj, dej tsaws tsag)
- ISO: 100 (los yog qis li sai tau)
- Lub sijhawm qeeb qeeb ntawm ob peb feeb mus rau ob peb feeb
- Yuav tsum muaj lub tripod, siv lub timer lossis chaw taws teeb kom tsis txhob muaj kev co
ISO los ntawm tes thiab ISO tsis siv neeg: Qhov twg zoo dua?
Tsis muaj lwm txoj kev xaiv zoo dua li no. Kev siv tes ua kom ISO zoo dua rau kev sib xws thiab kev tswj xyuas zoo. Kev siv auto ISO zoo dua rau kev ceev, tshwj xeeb tshaj yog thaum lub teeb hloov pauv sai, xws li thaum mus ncig ua si, mus koom kev ua tshoob, lossis mus ncig ua si.
Ib qho kev pom zoo uas cov kws thaij duab feem ntau ua yog siv Auto ISO ntawm qhov siab tshaj plaws (piv txwv li, ISO 3200) thiab teeb tsa qhov ceev shutter tsawg kawg nkaus. Qhov no tso cai rau lub koob yees duab kho qhov ISO yam tsis pub dhau koj qhov kev kam rau suab nrov.
Cov Lus Qhia Ntxiv Rau Kev Txo Qhov Nrov
1. Siv hom ntawv RAW kom muaj chaw kho ntau dua.
2. Kev siv lub teeb kom raug yuav txo qhov xav tau tsa cov duab ntxoov ntxoo.
3. Qhib qhov kev ruaj khov (IBIS/IS) yog tias muaj kom tso cai rau qhov ceev ntawm lub koob yees duab qeeb dua yam tsis muaj qhov tsis meej (txawm hais tias nws tsis pab nrog kev txav ntawm cov khoom).
4. Siv kev tshem tawm suab nrov me ntsis thaum kho kom raug; kev tshem tawm suab nrov ntau dhau tuaj yeem tshem tawm cov ntsiab lus thiab ua rau cov duab zoo li "plasticky."
5. Paub txog koj lub koob yees duab tus cwj pwm: sim ntau yam ISOs thiab saib seb koj tseem txaus siab rau qhov zoo li cas.
Xaus
Kev teeb tsa ISO ntawm lub koob yees duab digital yog ib qho txuj ci tseem ceeb rau kev tsim cov duab ntse, ci ntsa iab, thiab zoo. Lub hauv paus ntsiab lus yooj yim: siv ISO qis tshaj plaws rau qhov zoo tshaj plaws, tab sis tsis txhob yig los nce nws thaum koj xav tau qhov ceev shutter ceev dua lossis thaum lub teeb tsawg. Los ntawm kev nkag siab txog qhov cuam tshuam ntawm ISO rau suab nrov thiab dynamic range, thiab xyaum cov tswv yim los txiav txim siab qhov ceev shutter tsawg kawg nkaus thiab kev ntsuam xyuas histogram, koj tuaj yeem txiav txim siab tau zoo hauv daim teb.
Thaum kawg, ISO tsis yog tus yeeb ncuab - nws yog ib qho cuab yeej. Thaum siv nrog kev paub, ISO tes yuav pab koj tswj qhov tshwm sim kawg, es tsis txhob cia lub koob yees duab txiav txim siab xwb.
