Video: Dab tsi yog focal ntev hauv daim duab duab hluav taws xob?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Txhais: Focal ntev . Focal ntev (qhia hauv liab) yog nrug deb nruab nrab ntawm qhov nruab nrab ntawm lub lens convex lossis daim iav concave thiab focal taw tes ntawm lub lens lossis daim iav - lub ntsiab lus uas sib luag duab tshav ntawm lub teeb pom kev, lossis sib tshuam.
Thiaj li, dab tsi yog qhov ntev focal?
Focal Ntev thiab Lub kaum sab xis pom. Cov focal ntev ntawm lub lens yog nrug deb nruab nrab ntawm lub lens thiab cov duab sensor thaum cov ntsiab lus nyob hauv ua kom pom tseeb , feem ntau tau hais hauv mm (piv txwv li, 28 mm, 50 mm, lossis 100 mm). Qhov luv focal ntev (piv txwv li 18 hli), lub dav pom kev dav thiab thaj chaw tau zoo dua.
Ntxiv mus, dab tsi yog 3 txoj kev siv tau zoo tshaj plaws hauv cov iav? Qhov "peb tus duab hluav taws xob tseem ceeb" uas tau siv los ua kom pom qhov chaw duab thiab qhov loj yog:
- Ib txoj kab hluav taws xob los ntawm sab saum toj ntawm cov khoom txuas mus rau qhov nruab nrab kab nruab nrab rau lub lens.
- Ib txoj kab hluav taws xob hla nruab nrab ntawm lub lens, uas yuav tsis pom kev.
Hais txog qhov no, daim duab duab hluav taws xob yog dab tsi?
A duab hluav taws xob yog a daim duab uas taug txoj hauv kev uas lub teeb yuav siv rau tus neeg los saib lub ntsiab lus ntawm daim duab ntawm ib yam khoom. Nyob ntawm daim duab , duab tshav (kab nrog cov xub) tau kos rau qhov xwm txheej duab tshav thiab qhov kev xav duab tshav.
Lub lens mis yog dab tsi?
A mis mos mis tej zaum yuav txhais raws li mis uas muab kev sib raug zoo ntawm qhov nrug deb ntawm daim duab (v), nrug ntawm cov khoom (u), thiab qhov ntev focal (f) ntawm tsom iav.
Pom zoo:
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