Waa maxay in la raadiyo marka aad dooranayso gelis? Aperture - mid ka mid ah ku soo koobin ugu muhiimsan

Aperture - taasi waa mid ka mid ah oo xuduudaheedu ugu weyn on kaas oo aad rabto in aad fiiro gaar ah marka aad dooranayso gelis. Aperture qalab indhaha muujinaysaa heerka attenuation istaagayn iftiinka.

In si kale loo dhigo, dhimaya waxay muujinaysaa taas oo qayb ka mid ah ka daadanayo iftiin u gudbin karaan laftiisa loo marayo nidaamka gashto Ujeedada. daadanayo iftiinka marka iyada oo qalab indhaha qayb ahaan kala firdhiyey oo ka muuqata by siku marayay waxaa qayb ahaan u nuugo qalab ee siku waxaa la soo saaray (caag indhaha, galaas). Sidaas darteed, waxaa si xooga daciifin karaan sabab u ah, kuwaas oo astaamaha jirka.

Si kastaba ha ahaatee, tani ma aha dhimaya kaliya in ay go'aamiso xoogga light-ururinta, kuwaas oo loo baahan yahay in fiiro gaar ah marka aad dooranayso gelis. qalab indhaha Aperture ku xiran tahay aperture ugu furan. aperture The more furan, oo iftiin u sii galo siku. Oo tan iyo aperture siku taas oo ah f / 1.8 ama 1: 1.8, waxaa loo arkaa more sida la gashto-aperture sare, f / 2.8 ama 1 marka loo eego: 2.8. Inta badan, si loo fududeeyo, ratio aperture qalab indhaha u go'aamiyo heerka aperture badnaan u furan, taas oo kuu ogolaanaya in aad u soo bandhigaan siku. Si kastaba ha ahaatee, ratio aperture ee waa xubno caan ku soo jireenka ah dhismaha nidaamka indhaha iyo qiimaha aperture of diaphragm ka keliya ee uu qabtaa qaar ka mid ah hawlaha la xiriira go'aaminta ratio aperture of qalab ah. Si kastaba ha ahaatee, ka dhibic la taaban karo of view, waa sahal inaad is barbar lenses of dhimaya ee qiimaha ugu badan ee suurto galka ah ee aperture furan. Sidaas waa maxay kuwanu laba fikradaha waxa loo arki karaa isku mid.

Ratio aperture nidaamka indhaha waxaa had iyo jeer la tilmaamay in ay qaaska ah ee faahfaahinta siku, laakiin sidoo kale waxaa la qorayaa on jidhka ka mid ah qalabka ku dhow xagga hore ee isha kuhaya. Tusaale ahaan, aperture ah ee siku Canon 24-70 f / 2.8. Waxaa la fahamsan yahay in la gashto toogashada sida ogolaan furitaanka aperture ah ugu badnaan 2.8. Taas macnaheedu waa in qalabka uma oggolaan doono in diaphragm in ay tilmaamaan 2.0, 1.8 iyo wixii la mid ah D..

siku, kaas oo u ogolaanaya aperture toogtay heerka qiimaha aperture f a / 1.2 in f / 2.8, waxaa loo arkaa a-aperture sare. Qalabka la heer ka f / 3.5 in f / 6.3, ma tilmaamayso-aperture sare, caadi ahaan loo yaqaan "madow" sida ay Marayaan qadar yar oo ah dheecaan iftiinka. Madaxda qaar ka mid ah wax soo saarka ee nidaamka indhaha (tus, Leica iyo Carl Zeiss), hannaankii qalabka sii daayo heerka luminosity ka f / 0,7 in f / 0,95. The lenses-aperture sare ugu badan ee ka mid ah sawir qaadayaasha - waa alaabtii la qiimo ah f / 1.4 in f / 2.8.

Haddaba ka fiirsada waxa saamayn dejinta ratio aperture ah. All faa'iidooyinka lenses kuwan waxaa la xiriira qiimaha aperture ah. Tani waa aperture toogtay maxaa yeelay, markaan u saameeyaa xaddiga maraayay iftiin iyagoo isha kuhaya oo qoto dheer oo duurka ku yiilleen. Sayidka, aperture ku gashto camera digital saameeyaa awood u leeyahay inuu sameeyo sahan iftiinka arag darnaayeen. The ka weyn qiimaha aperture ah, yar ayaa si qoto dheer ay duurka of jir ah, in uu yahay shay razmoyut xoog aan dhici aagga diiradda.