Lambobin F: Abokanka na ainihi cikin ɗaukar hoto

Haske ita ce lamba ɗaya kuma ba za a iya musantawa a cikin aikin ɗaukar hoto ba, don haka koyon sarrafawa, tsara shi da sarrafa shi ɗayan abubuwa ne na farko da dole ne mu koya yi. Godiya ga ci gaban ingantattun tsarin hanyoyin za mu iya sarrafa haske da daidaita shi da bukatunmu ba tare da ƙoƙari sosai ba kuma anan ne lambobin F suke shigowa.

Na tabbata kun ji wannan fiye da sau ɗaya game da F-tsayawa ko kunyi mamakin menene hankali ko mahaɗin da ke tsakanin lambobin adadi waɗanda ke bayyana akan tabarau na kyamararka. Abu ne mai sauƙin gaske kuma wannan yana nufin sarrafawa ko sarrafa hasken da injinmu yake aiki da shi. Ina ba ku shawara ku duba wannan labarin da sauransu game da daukar hoto da muke dasu a shafinmu domin zasu taimaka muku sosai don fahimtar aikin kyamarar ku da tsarin ta na ciki (zaku iya amfani da injin binciken da ya bayyana a yankin dama na sama) A kowane hali idan kuna da kowace tambaya zaku iya rubuta min tsokaci.

Don haka… menene ma'anar waɗannan lambobin?

Mun san cewa diaphragm shine sinadarin da ke kula da sarrafa adadin hasken da ya ratsa injin mu, mafi girman matakin budewa, karin haske zai iya fadawa cikin cikin kyamararmu saboda haka za a yada bayanai da nuances ta hanyar raƙuman haske. Muna iya sauƙaƙa cewa lambobin F wakil ne ko tsarin da ake amfani dashi don auna matakin buɗewar diaphragm ɗinmu.

Hanya na farko na aiwatarwar shine shigarwar haske a cikin na'urar, duk da haka ya dogara da yanayin tsarinmu, mataki na gaba zai zama ko na'urar firikwensin lantarki ko fim ɗin zahiri kai tsaye. Idan muna aiki a yanayin dijital, za a auna hasken da auna shi ta hanyar firikwensin, duk da haka idan muna aiki tare da tsarin analog (wanda ba a cika san shi ba da jimawa ba), fim ɗin zai bincika wannan bayanin wanda, ya dogara da matakin ƙwarewar sa, zai kama fiye ko informationasa bayani.

Menene ma'anar F-Stop?

Kamar yadda muka fada, zamu iya bambanta fadin bude ramin da ake tace haske ta ciki (diaphragm dinmu). A lokuta da yawa muna buƙatar rage wannan sararin kuma ta hanyar lambobin F za mu rage (ko kuma misali samfurin) adadin haske. Don rage adadin haske da rabi dole ne mu sanya yankin ya zama rabi kuma wannan yana da ma'ana tare da yin mataki ko ragin lambar F. Wannan yana nufin cewa zamu iya bin tsarin baya, ma'ana, ƙara diamita ko wurin da ake tace haske sau biyu abin da ake kira ƙari na cikakken tasha. Zamu iya maimaita wannan aikin har sai mun kai ga iyakar buɗewar manufarmu, wanda aka sani da tashar sifiri. Tabbas, wannan yana da tushe da kuma hikimar-lissafi a bayanta, amma na fahimci cewa a yanzu ba lallai ba ne a rinjayi su tunda yana iya rikitar da abubuwa fiye da yadda ake buƙata kuma ba dole ba. Zai sauƙaƙa tunatar da ku cewa don rage yanki na da'ira ko kewaya a rabi, muna buƙatar raba diamita ta hanyar murabba'in murabba'i na 2 = 1.41421356.

Sannan na bar muku darajar kowane lambobin F da tasha ko mataki da kowannensu ke wakilta:

tsaida 0 = f / 1.00000

tsaida 1 = f / 1.41421

tsaida 2 = f / 2.00000

tsaida 3 = f / 2.82842

tsaida 4 = f / 4.00000

tsaida 5 = f / 5.65685

tsaida 6 = f / 8.00000

tsaida 7 = f / 11.31370

tsaida 8 = f / 16.00000

tsaida 9 = f / 22.62741

tsaida 10 = f / 32.00000

Gabaɗaya, yawancin kyamarori suna ba mu damar buɗewa da rufe diaphragms ɗinmu ta bin matakai ko tsalle-tsalle na 1/3 ko 1/2, wannan yana nufin cewa suna ba mu damar daidaita adadin hasken da ke shiga ruwan tabarau ɗinmu da gefe. wanda ke tsakanin rabi da ninki biyu ko wani abu ƙasa da rabi a wannan yanayin na biyu canje-canje zai faru ta hanyar da ta fi ta hankali da kuma taushi nuances (matakai).

Yana da mahimmanci kuyi la'akari ...

• Lambobin F sune alamomi na girman sararin da diaphragm ɗinmu yake ƙirƙirawa kuma ta haka ne yake daidaita adadin hasken da ke shiga.

• Dole ne mu sani cewa idan muka ga wakilci tare da lamba babban harafi f (F) ko ƙaramin rubutu (f) muna magana ne game da tsarin wakilci daban-daban. Lokacin da muka sami ƙananan lambar F, wannan alamar tana faɗakar da mu cewa buɗewa ta fi girma saboda haka mafi yawan haske ya shiga; Koyaya, idan muka ga babban adadin F, yana mana gargaɗi akasin haka kuma wannan yana nufin yana nufin buɗewa mafi girma, saboda haka muna aiki tare da ƙaramin haske. Misali: isingara cikakken tasha zuwa babbar F yana yanke wutar a rabi. Rage cikakken tasha zuwa ƙananan F ya ninka adadin haske.

• Idan samfurin kamarar ku yana aiki tare da tsarin da aka raba zuwa matakai 1/3, dole ne muyi tsalle uku don cimma cikakkiyar buɗewa ko cikakken mataki. Idan, a gefe guda, kuna aiki tare da tsalle 1/2 dole ne mu ɗauki tsalle biyu don yin cikakken mataki.