Txawm hais tias koj tab tom xaiv lub koob yees duab module rau ib qho khoom siv kos lossis ua kom cov duab zoo, nkag siab txog kev sib raug zoo ntawmaperture, shutter ceev, thiabQhov tob ntawm thaj tsam (DOF)yog qhov tseem ceeb. Cov peb yam no ua haujlwm ua ke los txiav txim siab cov duab ci ntsa iab, ntse, thiab kev ua tau zoo ntawm kev pom.
Aperture yog dab tsi?
Covapertureyog qhov adjustable qhib sab hauv lub koob yees duab lens uas tswj ntau npaum li cas lub teeb mus txog cov duab sensor. Nws yog ntsuas sivf-cov, zoo lif/1.8, f/2.0, f/2.8,thiabf/4.
Tsis zoo li ntau tus lej, ame me f-tus lej txhais tau tias lub aperture loj dua, cia ntau lub teeb rau hauv lub koob yees duab. Aloj f- tus lej qhia tias qhov aperture me dua, txo tus nqi ntawm lub teeb tuaj.
Aperture ncaj qha cuam tshuam rau ob yam tseem ceeb ntawm kev yees duab:
Nphav
Qhov tob ntawm Field (DOF)
Yog tias qhov shutter ceev tseem tsis hloov pauv, ua kom lub aperture tso cai rau ntau lub teeb kom ncav cuag lub sensor, tsim cov duab ci dua. Conversely, txo qhov aperture txo lub teeb nkag mus rau lub lens, ua rau cov duab tsaus.
Yuav ua li cas Aperture cuam tshuam qhov tob ntawm teb
Qhov tob ntawm daim teb yog hais txog thaj tsam ntawm cov duab uas zoo nkaus li ntse.
A loj aperture (me f-number)tsim ibqhov tob tob ntawm daim teb, ua kom cov ntsiab lus ntse thaum tsim qhov muag plooj. Cov nyhuv no yog siv dav hauv kev yees duab portrait thiab kev pom kev siv tshuab uas xav tau kev cais tawm.
A me me aperture (loj f-number)tsim ibtob tob ntawm teb, tso cai rau cov khoom ntawm qhov sib txawv kom nyob twj ywm hauv kev tsom. Qhov no yog qhov zoo tagnrho rau kev yees duab toj roob hauv pes, kev tshuaj xyuas kev lag luam, thiab kev soj ntsuam daim ntawv thov.
Hauv cov ntsiab lus yooj yim:
Loj aperture → Daus DOF
Me me aperture → Deep DOF
Shutter Speed yog dab tsi?
Covshuttertswj ntev npaum li cas cov duab sensor raug rau lub teeb.
A ceev shutter ceev(xws li1/500 sec) freezes motion tab sis txo tus nqi ntawm lub teeb mus txog lub sensor.
A qeeb shutter ceevtso cai rau ntau lub teeb nkag mus, tsim cov duab ci dua tab sis ua rau muaj peev xwm ua kom pom qhov muag plooj.
Vim tias shutter ceev thiab aperture ob qho tib si cuam tshuam raug, lawv yuav tsum ua tib zoo sib npaug.
Cov kev sib raug zoo raug suav nrog suav nrog:
| Aperture | Shutter Ceev |
|---|---|
| f/2 | 1/500 s |
| f/2.8 | 1/250 s |
| f/4 | 1/125 s |
| f/5.6 | 1/60 s |
| f/8 | 1/30 s |
| f/11 | 1/15 s |
Cov kev sib txuas ua ke no muab qhov sib xws hauv qhov teeb pom kev zoo ib yam.
Nkag siab Aperture Values
Tus nqi aperture (f-number) yog xam raws li:
f- nab npawb=Lens Focal Length ÷ Zoo Aperture Diameter
Piv txwv li, lub lens 50 hli nrog qhov zoo aperture txoj kab uas hla ntawm 25 hli muaj qhov aperture ntawmf/2.
Txij li thaum lub teeb kis tau tus mob nyob ntawm thaj tsam aperture ntau dua li nws txoj kab uas hla, txhua qhov puv - nres hloov ob npaug lossis ib nrab ntawm lub teeb nkag mus rau hauv lub koob yees duab.
Xaiv Qhov Chaw Zoo
Cov ntawv thov sib txawv xav tau qhov sib txawv aperture thiab shutter ua ke.
Portrait Photography
Loj aperture (f/1.4–f/2.8)
Pem hauv ntej plooj
Zoo dua qis- lub teeb ua haujlwm
Toj roob hauv pes Photography
Me me aperture (f/8–f/16)
Ntau qhov tob ntawm thaj teb
Nthuav cov ntsiab lus thoob plaws tag nrho scene
Industrial & Embedded Vision
Ntsuas aperture, shutter ceev, thiab teeb pom kev zoo raws li kev tshuaj xyuas qhov tseeb, kev txav nrawm, thiab cov duab zoo yuav tsum tau ua.
