Tau txais kev txhaj tshuaj zoo nrog rau cov lens saum toj no rau koj lub DSLR
Muaj ntau ntau hom lenses lub koob yees duab thiab yam yuav tau xav txog, yog li koj yeej yuav tsum tau ua koj tshawb fawb ua ntej dhia nkag mus rau hauv lub lens muas. Yog xav pib, nws tseem ceeb kom paub tseeb tias cov iav qhov twg yog qhov uas cov koob yees duab, nrog rau cov hom dab zoo nkauj rau txhua tus.
Feem ntau, qhov tseem ceeb ntawm qhov kev paub lens yuav tsum paub yog lub focal ntev, uas muaj tuaj hauv millimeters. Ib tus lej (piv txwv li 28 mm) qhia tias ntev focal ntev los yog "prime" lens, thaum ib qhov chaw (piv txwv li 70-300mm) qhia tias lub lens zoom. Rau ib lub tswv yim ntawm dab tsi uas txhais tau tias, nco ntsoov tias tib neeg qhov muag hais tias muaj qhov sib npaug ntawm 30-50 mm ntawm lub koob yees duab thawm npo.
Tseem, qhov no tsis txawm pib los ntawm ntau yam thiab tsis yooj yim ntawm cov koob yees duab digital lo ntsiab muag. Tab sis, yog tias koj xav tias koj paub txaus los dhia hauv, ntawm no yog pib lub npe ntawm qhov zoo tshaj lo ntsiab muag rau DSLR koob yees duab.
Rau folks tab tom nrhiav rau ib tug nqis, ntau yam Canon prime lens, koj tus thawj koom ruam zoo tshaj yog tej zaum Canon tus EF 50 hli f / 1.8 STM. Nws yog sib thooj thiab cov koob yees duab APS-C DSLR, thiab nta 50 hli focal ntev nrog lub siab tshaj aperture ntawm f / 1.8. Nws tau txais focal ntev ntawm 80 hli ntawm APS-C cov koob yees duab thiab 50 hli ntawm cov duab thev duab. Nws tseem tau txais ib qho kev ua qoj ua rau kev sib tw, tsis txhob ntsiag to autofocus rau stills lossis video. Tag nrho cov specs ua nws ib lub cuab tam zoo tshaj plaws rau txhua yam ntawm kev siv duab rau yav tsaus ntuj duab, tab sis, raws li peb tau hais nyob rau hauv lub intro, nws zoo tshaj plaws yog tias koj twb paub tias dab tsi style ntawm shooter koj yog. Lo ntsiab muag muaj kev ua si heev, thiab qhov lens no los ntawm Canon yog tsis txawv.
Yog tias koj yog Nikon shooter nyob rau hauv kev ua lag luam rau ib yam zoo tshaj plaws tab sis pheej yig prime lens, kos tawm Nikon AF-S FX NIKKOR 50mm f / 1.8G. Nws tau txais ntau dua los yog tsawg dua qub specs thiab nta raws li Canon EF 50mm f / 1.8 STM ntawm ib tus nqi me ntsis dua. Nws tuaj yeem siv rau txhua yam los ntawm kev siv duab ua yees duab-koj tsuas yog muaj lub koob yees duab Nikon DSLR (hom qauv FX hom phiaj). Nws yog ceev, compact thiab ib qho kev xaiv rau cov pib tshiab thiab intermediate DSLR kev pab txog. Dluab tuaj tawm ntse thiab kom ntxaws, txawm tias tsis muaj lub teeb pom kev, thiab nws tus kheej muaj lub siab khov nrog ob peb cim ntawm kev sib tsoo lossis kev laus. Nco ntsoov, tias, qhov lens no muaj tsawg kawg nkaus kom nrug deb li ntawm 1.48 ft, uas txhais hais tias koj tsis tuaj yeem dhau ze rau koj cov ntsiab lus. Rau li ntawd, koj yuav tsum tau lub lens macro.
Macro zoom lo ntsiab muag yog cov feem ntau ntau yam ntawm DSLR lens, nrog ib tug ntau ntau li ntawm 40-200mm. Ntawm 70-300mm, qhov Tamron lens yog qhov zoo tshaj plaws rau kev tua shooting, tshwj xeeb tshaj yog xwm, tsiaj qus, kis las, thiab duab. Zoo li txhua lub lens macro, cov duab yuav rov qab los thiab ntse heev-uas yuav luag dhau los, yog tias muaj ib qho zoo li no. Me me, cov duab zoo li cov kab thiab cov paj tseem muaj peev xwm, txawm tias, nyob ntawm qhov loj ntawm qhov kev kawm, koj tuaj yeem tsis tuaj yeem ntes nws cov kev paub hauv kev ua kom pom tseeb. Ntau cov ntsiab lus nyob deb, tab sis, yuav muaj kev tsom xam thiab kev nplua nuj los ntawm kev zoom ntau. Nyob hauv qhov chaw, lub lens muaj qhov tsom xam tsawg kawg ntawm 59 ntiv, tab sis nrog lub hom macro uas nrug shrinks mus rau 37.4 nti. Qhov no ua rau nws muaj ntau hom kev lens rau ntau lub hom phiaj. Nrog versions muaj rau feem ntau Nikon, Canon, Sony, Pentax thiab Konica Minolta DSLRs, qhov Tamron yog ib qho kev xaiv haib rau avid kev pab txog ntawm pob nyiaj siv.
Nrhiav qhov zoo tshaj plaws standard zoom lens yog tsis yooj yim. Muaj ntau ntau txoj kev xwb, tab sis ob peb yog zoo li npawv raws li Sigma 24-105mm F4.0 DG OS HSM lens rau Canon (Nikon thiab Sony variants muaj zoo li). Rau nws cov lus nug, koj yuav pom zoo ua ke ntawm cov duab zoo thiab xov tooj khwv yees nrog rau qhov tseem ceeb ntawm kev ua kom cov zoom zoom siab npaum li sai tau tsis muaj kev cuam tshuam.
Yam tsawg kawg ntawm 17 inches thiab siab tshaj plaws ntawm 1: 4: 6 ua rau Sigma zoo rau kev kaw thiab zooming. Lub 24-105mm F4 zoom ua tiav nrog Sigma tus Hyper Sonic Tsav (HSM) uas ua rau lub iPad ceev, ntsiag to thiab muaj tseeb autofocus alongside optical stabilization. Cov txheej txheem ua kom muaj qhov hnyav thiab qhov loj ntawm lub lens tag nrho thiab, ntawm 1.95 phaus, nws yooj yim mus rhaub rau hauv ib lub hnab. Dua li duab capturing, Sigma tau ntxiv USB dock compatibility, uas tso cai rau lub lens mus txuas ntawm lub computer kom kho cov khoom kho tshiab.
Rau cov nyiaj, Canon tus EF-S 55-250mm F4-5.6 IS STM lens yog qhov zoo tshaj tus nqi-rau-duas nqi koj yuav pom hauv lens telephoto. Nrog lub focal ntev thiab qhov siab kawg ntawm qhov nruab nrab ntawm 55-250 hli thiab 1: 4-5.6, tus Canon yog zoo li thaum ze-ups nrog ib tug tsom deb ntawm 2.8 taw. Nrog kho qhov muag stabilization ntawm lub rooj tsavxwm, Canon tuaj yeem pab tiv thaiv rau kev xuas tes tuav ntawm cov neeg siv cov koob yees duab uas muaj teeb meem tuav ib tus yees tes thaum tseem ceeb.
Cov koog tsev kawm ntawv ntawm OIS pabcuam Canon qhov kev cuag tau thiab txav ntawm cov khoom ntaws sab nraud thaum tuav lub tsho tshaj tawm. Lub lens kuj muaj xws li Canon's Movie Servo AutoFocus technology, uas kom muaj kev ntsiag to kev kho kom ntev ntev uas yuav tsis cuam tshuam cov ntsiab lus lossis lub ntiaj teb nyob ib ncig ntawm koj. Ntxiv cov ntxaij lim dej (polarizing lim) yog ib qho khoom plig, ua tsaug rau sab xub ntiag ntawm lub lens tsis tig. Nyob ntawm 1.2 lbs xwb, lub lens yog compact txaus uas nws tau zaum hauv ib lub koob yees duab yees tsis noj ntau ntau chav los yog ntxiv ntau tshaj qhov nyhav.
Sigma yog dav dav raws li ib qho ntawm cov lens saum toj kawg nkaus nyob hauv kev lag luam, thiab yog qhov loj tshaj plaws ntawm kev lag luam lens chaw tsim khoom hauv lub ntiaj teb. Lawv raug tso siab los tsim cov lo ntsiab muag ruaj ruaj, kom pom tau tias muaj ntau yam koob yees duab thiab tua cov hom phiaj, thiab qhov lens ultra-wide tsis yog qhov sib txawv. Nrog ib chav focal ntawm 10-20 hli xwb, koj paub tias nws yuav xa ib qho loj qhov tob ntawm daim teb, pab mus ntes tag nrho cov vaj tse, cov chav loj thiab lwm yam kev kawm sib txawv. Lawv feem ntau yog npaj rau kev tsim txuj ci tsim vaj tse, kev kawm ua haujlwm hnyav thiab sab hauv tsev. Nws muaj kev tsom xyuas ceev ceev, kev nqis tes ua kom zoo, lub zog ruaj khov thiab muaj xim zoo nkauj thiab zoo nkauj. Versions ntawm no lens yuav txuas nrog Canon, Nikon, Pentax thiab Sony DSLR koob yees duab.
Nikon cov tswv yuav tsum tau saib mus rau Tamron AF 70-300mm f / 4.0-5.6 lub lens vim nws yog ib tus thawj Tamron lo ntsiab muag tuaj nruab nrog Ultrasonic uas ntsiag to Drive (USD), uas ua rau kub-ceev tsom. Qhov no txhais tau hais tias qhov lens no zoo rau kev ntes txhaj tshuaj thaum caij haiv neeg, kis las los sis lwm yam ceev nrooj. Lub Tamron kuj ntxiv kev mob ntawm kev pabcuam los pabcuam nrog cov neeg tsis tuaj yeem tivthaiv nyob rau hauv kev xiab uas tsis muaj teebmeem dabtsi.
Integrating full-time kev ceev nruj yog lwm highlight, uas tso cai rau ib tus kws yees duab ua kev kho me ntsis rau hauv lub caij uas tsis tas xav siv keyboards lossis menus. Cov lus qhia ntawm phau ntawv no ntawm Tamron pub rau cov tswv yim zoo heev txawm tias muaj nyob rau hauv txoj kev tshwm sim uas tus kws yees duab qhov tob ntawm qhov kev txwv. Yog tias nws tsis zoo nkauj dua li lwm yam lo ntsiab muag nyob rau hauv nws hoob, Tamron tau tsim los rau kev ua haujlwm zoo thiab xa ib txoj kev ua neej tsis muaj kev vam meej thaum txhua yam kev ua yeeb yam.
Ib qho ntawm qhov ceev tshaj plaws thiab ntse tshaj plaws ultra-wide lo ntsiab muag muaj, Tokina 11-16mm f / 2.8 AT-X116 yog ib qho yuav tsum-rau Canon cov koob yees duab tswv. Txoj cai tawm lub nplhaib, koj yuav pom tias yog tsis muaj teebmeem kev kho qhov muag, tab sis nws muaj tsawg tsawg zaus nyob rau qhov twg koj yuav plam qhov feature no tau muab qhov f / 2.8 aperture thiab focal ntev ntawm lub Tokina. Zoo hmoo, uas yog qhov teeb meem kawg. Lub Tokina yog ib hom kabmob wide-angle lens uas ua tau zoo nyob hauv lub teeb uas tsis muaj teeb pom kev zoo, ua tsaug rau lub siab tshaj plaws uas ua rau kom qis qis, tshwj xeeb tshaj yog muaj zog nrig.
Tokina kev xaiv ntawm 11-16mm tsis tawm ntau zoom rau kev ua hauj lwm nrog, tab sis muaj ntau tshaj qhov tob ntxiv ntxiv txaus zoom rau siab ntawm cov npoo ntawm cov duab thaum tseem ceeb hais txog qhov chaw kawm. Uas tsuas yog 1.2 phaus, Tokina yog lwm qhov lens uas zoo meej rau kev mus ncig-mus-ncig mus ncig los yog cia li compact txaus nqa lub nroog.