Paub txog qhov zoo thiab qhov tsis zoo ntawm txhua hom iav thav duab

Paub txog qhov zoo thiab qhov tsis zoo ntawm txhua hom iav thav duab

1. Tag nrho cov ncej: Lub thav duab nrog tag nrho cov lo ntsiab muag ncig los ntawm daim iav rings.
Qhov zoo: Kev ruaj khov, yooj yim rau kev teeb tsa, lens ntug tiv thaiv, npog ib feem ntawm lub lens tuab, tsis yooj yim rau kev cuam tshuam glare.
Disadvantages: me ntsis hnyav, yooj yim xoob xauv nozzle ntsia hlau, tsoos style.
2. Ib nrab thav duab: lub lens yog ib feem ntawm lub nplhaib iav.Vim tias lub lens yuav tsum tau muab tso rau ib puag ncig thiab kho nrog cov xaim zoo, nws tseem hu ua ntses hlau khib thiab hlau kos duab khib
Qhov zoo: sib dua li tag nrho cov ncej, tsis muaj cov ntsia hlau txuas nrog lub lens, tshiab.
Disadvantages: me ntsis muaj feem ntau ntawm ntug kev puas tsuaj, ib nrab glare cuam tshuam, lens thickness yuav pom.
3. Rimless: tsis muaj daim iav nplhaib, thiab lub lens yog tsau rau ntawm tus choj ntawm lub qhov ntswg thiab pawg (daim iav ceg) nrog screws.
Qhov zoo: Sib dua li ib nrab thav duab, lub teeb yuag thiab nqaij, lub lens zoo tuaj yeem hloov kho kom tsim nyog.
Qhov tsis zoo: me ntsis lub zog tsis zoo (cov ntsia hlau xoob thiab ntu) nrog kev cuam tshuam glare, me ntsis muaj feem ntau ntawm lub lens ntug kev puas tsuaj
4. Kev sib xyaw ua ke: lub cev muaj ob txheej ntawm lo ntsiab muag, uas tuaj yeem tig los yog tshem tawm.
Qhov zoo: yooj yim, tshwj xeeb xav tau.
5. Folding ncej: Lub thav duab tuaj yeem folded thiab tig rau ntawm tus choj ntawm lub qhov ntswg, lub taub hau thiab ceg ntawm daim iav.
Qhov zoo: Yooj yim nqa.
Disadvantages: hnav ib qho teeb meem me ntsis, pob khawm xoob deformation yuav ntau dua.
6. Caij nplooj ntoos hlav thav duab: Lub caij nplooj ntoos hlav siv los txuas lub pob khawm ntawm lub iav tsom iav ceg.
Qhov zoo: Nws muaj qee qhov chaw qhib kom rub tawm sab nraud.
Disadvantages: Ntau cov nqi tsim khoom thiab qhov hnyav.