Ungayisebenzisa Kanjani I-Flash Yakho Ngokuphumelelayo Emifanekisweni (Ingxenye 1 kwezingu-5) - ngu-Blogger Wesihambeli se-MCP uMatthew Kees

UMatthew Kees ungumthwebuli wezithombe onethalente futhi uthisha. Wenza uchungechunge lwezingxenye ezi-5 ku-MCP Actions Blog on Using the Modern Flash for Portraits. Ngijabule ukwabelana ngolwazi nobungoti bakhe nabo bonke abafundi bami. Lezi zifundo zizokwethula kanye njalo ngesonto. Kwamanye amasonto, isikhathi sivumelekile, uMathewu uzobheka isigaba SOKUPHAWULA bese ephendula eminye imibuzo yakho. Ngakho-ke qiniseka ukuthi ubuza imibuzo yakho ngqo esigabeni sokuphawula ngalokhu okuthunyelwe.

Le yingxenye 1 kwezingu-5.

ngu-Matthew L Kees, isivakashi se-MCP Actions Blog

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I-TTL OTF Flash (“uma isicathulo silingana…”)

Enye yentuthuko enkulu kakhulu yokufotwa kwezithombe yafika ngo-1974 lapho i-Olympus imemezela ikhamera yayo ye-OM-2 kanye ne-Quick Auto 310 TTL OTF flash. Laba bobabili basebenze ndawonye kumodi ye-flash "ezinikele".

Lokhu kusho ukuthini, ikhamera ne-flash banamandla okuxhumana omunye nomunye. Okukhipha i-flash kulawulwa "ngeso" noma inzwa, etholakala ngaphakathi komzimba wekhamera ofunda ukukhanya okudlulile nge-The Lens (TTL) ne-bounced Off The Film (OTF).

Umlinganiso we-TTL OTF wenziwe waba khona ngokusebenzisa “amachashazi” angeziwe esicathulweni esishisayo sekhamera esifana nokuxhumana okwengeziwe onyaweni lwe-flash. I-flash nekhamera bakwazi "ukukhuluma" omunye komunye ngokusebenzisa lezo zixhumanisi ezengeziwe. Inzwa engaphakathi kwekhamera itshele i-flash lapho ukukhanya okwanele kufinyelele kwifilimu ngesikhathi sokuvezwa, futhi kwaqedwa i-flash ukuze kungabe kusakhanywa ukukhanya. Umphumela waba ukuvezwa kwe-flash okuhle njalo.

Ngaphambi kokuthi siqhubekele phambili, ngidinga kuqala ukuchaza ubuchwepheshe obudala be-flash.

Indlela okukhishwa ngayo ukukhanya kwe-flash ilawulwa kwimodi ye-Manual, ukuthi lapho kusethwa amandla amakhulu ukuqhuma kwe-flash, noma i-flash pulse, kuhlala isikhathi eside kunalokho okwenzeka kusethingi yamandla aphansi. Ekusetheni okuphezulu i-flash pulse inesikhathi esizungeze u-1/1000 wesekhondi elide - "imbobo" enkulu yokukhanya. Ekusetheni ugesi okuphansi kakhulu kusondele ku-1 / 40,000 womzuzwana - "ukukhanya" okuncane kokukhanya.

Lapho i-flash yesimanje ifakwa kukhamera yefilimu bese isethwe kumodi ye-TTL OTF, inzwa ye-OTF isekela ubude be-flash pulse kusethingi yemitha yekhamera. Imvamisa, i-ISO isethwe ekulinganisweni ebhokisini lapho ifilimu ingene khona. Lokhu kungenxa yokuthi amafilimu aphansi e-ISO adinga ukukhanya okwengeziwe ukwenza ukuvezwa okuhle kunamafilimu aphezulu e-ISO.

Uma ufuna ukukhanya okungaphansi kunalokho okudingwa ifilimu empeleni, njengokuthinta ukukhanya kokugcwalisa ngaphandle, umane uguqule ukusethwa kwe-ISO emzimbeni wekhamera, uye kokuphakeme kunesilinganiso sebhokisi lefilimu. Isilinganiso sangempela sefilimu empeleni asiguquki empeleni, ukhohlisa inzwa ye-OTF ukuthi ucabange ukuthi ifilimu ebilayishiwe idinga ukukhanya okungaphansi kwe-flash kunalokho ekwenzayo ngempela. Ngokuthola ukukhanya okungaphezulu kwe-flash wehlisa ukusethwa kwe-ISO.

Amakhamera edijithali ahlukile. Awukwazi ukukhohlisa inzwa ngokushintsha izilungiselelo ze-ISO. Ukulungisa ukusethwa kwe-ISO kwi-digital SLR kufana nokushintsha ifilimu khona manjalo ube nesilinganiso sebhokisi esisha. Ukuzwela kwe-chip kuyanda ngesethingi ephezulu ye-ISO noma kuncipha nge-ISO ephansi, ngakho-ke ukulungiswa okusha kwe-TTL kudinga ukwenziwa.

Ukukhanya kwesimanje, kanye nemizimba eminingi yekhamera ye-DSLR, kungeze ukusethwa kwe-EV kwe-flash lapho isethwe kumodi ye-TTL.

I-EV imele inani lokuvezwa. Uma usetha i-ISO, f / stop nesivinini se-shutter usebenzisa imitha yokuvezwa, kusekelwe kuNani Lokubonisa laleso senzakalo. Ngemuva kwalokho ungalungisa ukugqama kwesimo ngokushintsha ukusethwa kwe-EV emzimbeni wekhamera. I-EV plus yenza indawo icace futhi i-EV minus iyenza ibe mnyama. Ukulungisa ukukhanya kwe-flash, kufanele ushintshe ukusethwa kwe-EV kwe-flash. Lokhu kuvame ukubizwa ngokuthi yi-Flash Exposure Compensation noma i-FEC.

Njengoba kushiwo ngenhla, kungenzeka futhi ukulungisa i-flash kusuka emzimbeni wekhamera kumakhamera amaningi edijithali, enza umqondo ophelele, ngoba inzwa elawula i-flash itholakala lapho.

ICanon ilebula uhlelo lwayo olusha sha lwe-TTL, i-E-TTL II, emele i-Evaluative TTL version 2. Uhlelo luka-Nikon lwe-Creative Lighting lubizwa ngokuthi i-TTL nge-TTL ehlakaniphile. Kokubili kunamandla okulawula i-flash ekhamera noma ukuvala ukwenyuka kokuma kokukodwa kokuthathu (i-EV = 0.3) ngokulungisa kahle ukuvezwa kwe-flash.

Vele, amakhamera edijithali e-Olympus ane-TTL futhi, njengoSony namanye amaMinoltas amadala, kanye nePentax, iPanasonic, iSigma, iRicoh, iFuji kanye nawo wonke amakhamera anamuhla enziwe. Ngokusebenzisa i-The Lens flash control sekuyinto ejwayelekile yazo zonke izinhlelo zesimanje ze-flash / camera.

Into eyodwa edinga ukushiwo lapha, ukuthi awukwazi ukubeka i-Canon E-TTL flash emzimbeni weNikon (noma enye imodeli) bese uyisebenzisa kumodi ye-TTL. Oxhumana nabo abasetshenzisiwe batholakala ezindaweni ezihlukene esicathulweni esishisayo. Futhi ukusebenzisa i-TTL engenantambo ekude uzodinga i-flash eyenziwe ngumenzi ofanayo nekhamera yakho.

Noma kunjalo, kungenzeka ukuthola ukukhanya kwesithathu okusebenza kumodi ye-TTL lapho kufakwe kukhamera yakho. I-Metz, i-Sunpak, i-Vivitar, i-Osram njll. Konke kwenza ukukhanya kwe-TTL ngezinyawo ezahlukahlukene ngezindlela ezahlukahlukene zamakhamera. Bebevame ukwenza isitayela esisodwa sikhanyise futhi wena uthenge “unyawo” oludinga ngokwehlukana. Yabizwa nge-adaptha ye-flash ye-SCA. Manje benza imodeli efanayo yokukhanya enezinyawo ezahlukahlukene ezibunjiwe. Uma uhamba kulo mzila, qiniseka ukuthi i-flash ilebulwe ngohlobo lwekhamera yakho. Ungathola i-TTL flash ekwazi ukubiza cishe ama- $ 100 USD uma uthenga eyodwa kunkampani eyenza ukukhanya kuphela.

Amasistimu wesimanjemanje wekhamera / i-flash TTL abuye acabangele ubude obugxile belensi, ibanga lokugxila namaphuzu wokugxila akhethiwe lapho kudutshulwa kwimodi ye-AF. Uma ubude be-vario-focal, noma i-lens "zoom" bufakiwe, khona-ke ubude be-focal ku-zoom busetshenziswa.

Ukukhanya okuningi okusha kunamakhompyutha amancane. INikon SB-900 entsha ilungisa ngokuzenzakalela okukhiphayo kwayo kufomethi yesenzwa ye-imaging futhi inendlela yokwenza ukukhuphula izinga le-firmware. Baqhamuke kude nokuvele babheke phezulu kwifilimu bese bevala ngesikhathi esifanele. Ukukhanya okusha kuthuthukile ngezindlela eziningi njengekhamera uqobo, futhi yingakho ibiza kancane kakhulu kunangaphambi kwayo.