Dab tsi aperture siv?

Cov txheej txheem:

Dab tsi aperture siv?
Dab tsi aperture siv?
Anonim

Qhov zoo tshaj plaws, koj yuav siv lub lens nrog qhov siab tshaj plaws aperture ntawm f / 2.8 lossis dav dua. Thaum sim kom tau txais cov hnub qub pinpoint, lub hom phiaj yog kom tso lub teeb kom ntau li ntau tau (cov hnub qub tsis zoo li ntawd, tom qab tag nrho). Txoj hauv kev los ua kom pom kev nthuav dav yog qhib qhov aperture, qeeb lub shutter ceev, thiab nce ISO.

Kuv paub li cas aperture siv?

Qhov no yog vim qhov aperture yog ntsuas los ntawm f-tus lej lossis f-nres, uas yogpiv ntawm lub lens 'focal length muab faib los ntawm qhov ua tau zoo aperture txoj kab uas hla. Yog li yog tias koj siv lub lens 200mm thiab faib nws los ntawm 50mm aperture inch qhib, koj xaus nrog f-stop ntawm 4, lossis f / 4.

Kuv yuav tsum tua aperture ntawm dab tsi?

Yog tias koj xav tau lub shutter ceev me ntsis, mus nrog qee yam ze rau f/5.6; Yog tias koj xav paub tseeb tias txhua yam yuav ua kom pom tseeb, mus nrog qee yam ze dua f/11. Yog tias koj tsis paub meej tias yuav siv qhov aperture, nruab nrab ntawm f / 5.6 thiab f / 8yuav tsum yog koj lub neej ntawd.

Thaum twg koj yuav siv lub aperture qis?

Lub aperture qis dua txhais tau tias lub teeb ntau dua nkag mus rau lub koob yees duab, uas yog qhov zoo dua rau cov xwm txheej qis. Ntxiv rau, qis apertures tsim qhov tob zoo ntawm daim teb, ua rau tom qab qhov muag plooj. Koj xav siv lub aperture qis thaum koj xav tau kev txhaj tshuaj ntau dua.

Thaum twg koj yuav siv 1.4 aperture?

Yog tias koj're txaus nyob deb ntawm koj qhov kev kawm, ces siv f/1.4 yuav ua rau feem ntau ntawm koj qhov kev kawm tsom mus. Yog kojmuaj qhov ua tau zoo AF system (ib yam dab tsi zoo li 7D tej zaum), ces koj yuav muaj peev xwm ua kom lub ntsiab lus tseem ceeb raws nraim qhov koj xav tau.

Pom zoo:

Nthuav cov khoom
Vim li cas thiaj li ua pov thawj qhov kev soj ntsuam?
Nyeem ntxiv

Vim li cas thiaj li ua pov thawj qhov kev soj ntsuam?

Kev Tshawb Fawb Txog Kev Pom Zoo (CFA) yog cov txheej txheem txheeb cais siv los txheeb xyuas cov qauv ntawm cov txheej txheem pom zoo. CFA tso cai rau tus kws tshawb fawb los ntsuas qhov kev xav tias muaj kev sib raug zoo ntawm cov kev hloov pauv tau pom thiab lawv cov hauv paus latent tsim muaj.

Qhov twg yog genicular anastomosis?
Nyeem ntxiv

Qhov twg yog genicular anastomosis?

a periarticular arterial network hla pem hauv ntej thiab ob sab ntawm lub hauv caug, tsim los ntawm cov ceg ntawm cov hlab ntsha genicular, ntawm tsib cov hlab ntsha genicular los ntawm popliteal, ntawm tibial anterior rov tshwm sim, thiab ntawm fibular circumflex ceg ntawm lub posterior tibial.

Kuv yuav tsum tsiv mus rau modesto ca?
Nyeem ntxiv

Kuv yuav tsum tsiv mus rau modesto ca?

Modesto yog qhov chaw zoo los pib tsev neeg nrog cov kev kawm tshwj xeeb rau cov menyuam yaus. Modesto muaj ntau qhov chaw mus kav khw thiab noj. Hauv plawv nroog txhim kho thiab zoo nkauj heev, tshwj xeeb tshaj yog txij thaum hmo ntuj tawm mus thiab qee qhov kev nyab xeeb raug ntiav.