Yog tias koj yog tus tswv zoo siab ntawm Canon SLR lub koob yees duab, ces tej zaum koj yuav muaj kev xav txog kev yuav khoom optics ntxiv. Tau kawg, nws yog qhov yooj yim dua rau cov neeg nyiam ua haujlwm kom tau txais cov qauv thoob ntiaj teb uas tsim nyog rau kev tua txhua hnub thiab kev mus ncig. Ib qho kev xaiv zoo tshaj plaws yog Canon 18-200 EF-S. Tsis tas li ntawd, nws yog qhov ntau heev, koj tuaj yeem pom nws hauv yuav luag txhua lub khw.
Tab sis cov khoom no, txawm li cas los xij, zoo li txhua lub lens, muaj ob qho zoo thiab qhov tsis zoo. Cia peb saib ntawm qhov zoo, nruab nrab thiab qhov tsis zoo. Tom qab ntawd, ntawm qhov kawg ntawm tsab xov xwm, koj yuav nyeem qee cov lus pom zoo.
Leej twg yog lo ntsiab muag
Lub Canon 18-200 lens yog tsim los rau ntau yam kev tua, txhais tau tias nws tuaj yeem siv tau ntau yam kev siv:
- travel, excursions;
- hnub so thiab noj hmo;
- duab portrait;
- "kev yos hav zoov" (tua tsiaj, noog, tsheb);
- reportage thiab lwm yam.
Peb tuaj yeem hais tias lub lens no haum rau yuav luag txhua tus neeg uas xav kom tau txais cov duab zoo tsis yog rau kev nco xwb, tab sisthiab rau xov xwm, vev xaib, nthuav qhia.
Tus qauv hais ntawm no muaj "zoom", uas txhais tau hais tias "tua ntawm ntau qhov ntev ntawm focal ntev." Qhov no txhais tau hais tias ua tsaug rau xws li lub lens, lub koob yees duab tuaj yeem zoom hauv lossis tawm. Tus kws yees duab tsis tas yuav txav los ze lossis txav deb ntawm qhov chaw kom ntes tus ncej tag nrho.
Kev ncaj ncees ntawm tus qauv
Nws tsim nyog tau paub Canon 18-200 zoo dua. Kev tshuaj xyuas txog nws feem ntau yog qhov zoo. Tseeb tiag, lub lens muaj qhov zoo hauv qab no:
- nrawm nrawm;
- duab tawm meej;
- koj tuaj yeem kho qhov ntse ntawm manually lossis txiav;
- ntau yam ntawm focal ntev muaj;
- txhua hom kev tua yog ua tau.
Yog li, peb tuaj yeem suav tias qhov zoo ntawm cov duab tsis poob. Tab sis rau peb txhua tus ntawm cov txiaj ntsig tseem ceeb. Yog li ntawd, tus pib tuaj yeem nyab xeeb yuav qhov kev xaiv tshwj xeeb no.
Raws li tus nqi, nws qis dua rau lwm tus qauv thoob ntiaj teb raws li tus nqi. Yog li ntawd, lub lens no belongs rau cov kev xaiv nyiaj txiag.
Technological deficiencies
Txawm tias cov duab zoo nkauj heev, tus nqi tsim nyog, muaj qee qhov tsis zoo.
Nws yog qhov zoo dua los coj lawv mus rau hauv tus account kom tom qab koj tsis tas yuav khuv xim yuav Canon 18-200. Hauv cov ntsiab lus, cov lus hais tsis yog qhov tseem ceeb, tab sis tuaj yeem ua rau tag nrho cov kev xav rau qee tus kws yees duab nyiam siv:
- Thaum tua, "lub cev" ntawm lub lens feem ntau tawm,tshwj xeeb tshaj yog thaum tua ntawm nruab nrab focal lengths. Ntawm 18 mm thiab 200 mm, lub lens yog kho zoo.
- Chromatic aberration tuaj yeem tshwm sim hauv qee hom kev tua, ua rau cov duab tsis zoo. Tib lub sijhawm, xws li qhov tsis zoo yuav tsum tau kho hauv Photoshop.
- Ntawm qhov ntev focal ntev, daim duab yog qhov muag plooj, suab nrov tshwm thiab qhov ntse qis. Cov neeg siv nco ntsoov tias qhov ntev ntawm 18-25mm thiab 150-200mm tsis muaj txiaj ntsig, lawv tuaj yeem suav tias tsis ua haujlwm.
- Lub lens tsis tsim nyog rau kev yees duab macro, vim nws tsis muaj kev nkag siab zoo rau kev yees duab ntawm qhov deb ze dua 45 cm.
- Canon 18-200 lo ntsiab muag, hmoov tsis zoo, tuaj yeem ua cov hmoov av los ntawm sab hauv tom qab siv sijhawm luv.
- Nyhav ntawm tus qauv yog 600g thiab lub lens txoj kab uas hla yog 72 hli. Tau kawg, tsis yog txhua tus yuav nyiam qhov loj thiab hnyav hnyav.
Tus uas mob siab rau qhov zoo ntawm lawv cov duab feem ntau tsis nkag mus.
Neutral side
Raws li koj paub, txhua yam khoom tuaj yeem muaj qhov zoo thiab qhov tsis zoo. Tab sis kuj tseem muaj kev tshuaj xyuas nruab nrab. Lub lens Canon 18-200 muaj cov lus qhia hauv qab no:
- Ib txwm aperture f/3, 5-5, 6. Qhov no txhais tau hais tias kev tua raug pom zoo thaum nruab hnub, sab hauv tsev nrog teeb pom kev zoo. Nrog rau kev teeb tsa lub koob yees duab kom zoo, koj tuaj yeem tau txais cov duab zoo txawm tias thaum tsaus ntuj.
- Qhov zoo ntawm cov duab lawv tus kheej yog qhov zoo heev, tab sis yog tias tus kws yees duab zoo ntawm qhov kev txawj no. Nws yog ntshaw nyob rau hauv tej yam kev mob (piv txwv li, nyob rau hauv tsis zoo teeb pom kev zoo tej yam kev mob) rau nruabtripod.
- Tus nqi ntawm tus qauv yog qhov nruab nrab piv rau cov analogues. Tab sis nws yog qhov zoo dua los nqa lub lens "native" rau lub koob yees duab.
Raws li koj paub, tsis muaj dab tsi zoo meej. Yog li ntawd, koj muaj peev xwm yuav yam xyuam xim yuav ib tug qauv uas yuav hloov ob peb lo ntsiab muag "qis-profile" ib zaug.
Cov lus qhia rau cov pib tshiab
Thaum yuav lub koob yees duab SLR, tsis txhob maj mus yuav cov lo ntsiab muag tam sim rau ib tus neeg tshwj xeeb. Qhov tseeb yog tias rau cov khoom siv koj yuav tau yuav ib lub hnab ev khoom loj, thiab qhov hnyav ntawm txhua yam khoom siv yuav loj heev. Tsis tas li ntawd, tag nrho cov nyiaj tau los yuav suav nrog.
Zoo dua tau txais Canon 18-200 lens thiab ob peb lwm yam uas yuav hloov pauv tag nrho, xws li telephoto thiab macro. Nco ntsoov tias kev txawj ntse lub koob yees duab zoo tau lees paub cov duab zoo nrog txhua lub lens.
