MAGNIFICATION
Thaum saib ib yam khoom nyob rau hauv ib lub chaw ntau pob loj, tej zaum koj yuav txhawj xeeb txog "kev nthuav dav. Magnification qhia tias qhov loj npaum li cas tshwm rau ntawm qhov muag liab qab thaum koj saib ntawm ob lub koob yees duab. yuav yog qhov kev ncua deb ntawm cov khoom, nws yog qhov zoo dua kom paub qhov luaj li cas ntawm lub chaw ntau pob thiab xaiv qhov tsim nyog magnification.
Formula "nruab nrab ntawm cov khoom faib los ntawm kev nthuav dav" yuav qhia rau koj paub qhov kev ncua deb ntawm cov khoom yuav pom los ntawm lub koob yees duab zoo li yog tias koj saib cov khoom tsis muaj nws.
Piv txwv li: Thaum qhov kev ncua deb mus rau theem yog 100m
Nrog 8x binoculars, 100÷8=12.5m
Nrog 10x binoculars, 100 ÷ 10=10m
Qhov kev ncua deb ntawm cov khoom zoo li yog 12.5 lossis 10m.
Tej zaum koj yuav xav tias, "Puas yog nws tsis zoo dua los siv qhov loj dua kom pom ze dua?" Txawm li cas los xij, qhov siab dua qhov kev nthuav dav, qhov nqaim ntawm qhov pom thiab qhov yooj yim dua qhov kev co yuav tshwm sim. Nyob rau hauv cov ntaub ntawv ntawm high magnification, kev siv lub tripod yog pom zoo, tab sis nyob rau hauv feem ntau qhov chaw xws li chaw ntau pob, kev siv lub tripod yog txwv tsis pub.
Rau kev tuav tes saib, qhov kev nthuav dav txog li 10x yog pom zoo kom tiv thaiv kom tsis txhob kov saib. Tsis ntev los no, muaj cov koob yees duab nrog cov duab stabilization (anti-vibration type) uas txo cov koob yees duab co txawm nyob rau hauv siab magnifications.
Tsis tas li ntawd, nws yuav zoo dua kom muaj "waterproof" binoculars uas tuaj yeem siv sab nraum zoov thaum nag los nag. Nws tsis tshua muaj pos huab thiab tuaj yeem siv nrog kev thaj yeeb ntawm lub siab.
Kev kaj siab
Rau kev ua si sab hauv tsev, "kev ci ntsa iab" yog qhov tseem ceeb tshwj xeeb los xyuas. Txij li thaum lub chaw ntau pob yog tsaus dua li sab nraum zoov, nws yog qhov zoo dua los xaiv lub koob yees duab nrog lub teeb ci siab. Lub ci ci yog txiav txim siab los ntawm kev nthuav dav ntawm lub koob yees duab thiab qhov zoo ntawm txoj kab uas hla ntawm lub hom phiaj lens.
Brightness=Lub hom phiaj lens zoo diameter² / Magnification².
Hauv lwm lo lus, yog tias qhov kev nthuav dav zoo ib yam, lub koob yees duab nrog lub taub loj dua ntawm lub hom phiaj lens yuav ci dua. Tsis tas li ntawd, yog hais tias lub aperture txoj kab uas hla yog tib yam, binoculars nrog ib tug qis magnification yog brighter.
Txawm li cas los xij, qhov loj dua lub hom phiaj lens txoj kab uas hla, qhov hnyav dua lub koob yees duab yuav yog, yog li rau kev tuav tes saib cov tsom iav nrog lub hom phiaj lens txoj kab uas hla ntawm 20mm txog 32mm raug pom zoo.
Tsis tas li ntawd, txawm tias muaj qhov ci zoo ib yam, kev saib cov duab zoo yuav txawv nyob ntawm cov khoom siv lens thiab cov txheej txheem lo ntsiab muag, thiab lwm yam, yog li nws yog ib qho tsim nyog los sib piv lawv ntawm lub khw.
FIELD OF SAIB
Rau cov kis las uas koom nrog ntau yam kev ua si, xws li ncaws pob thiab rugby, nws yog qhov zoo tshaj plaws los xaiv cov tsom iav tsom iav nrog qhov dav ntawm qhov pom (tus lej loj).
Kev pom tiag tiag yog thaj chaw uas tuaj yeem pom yam tsis tau txav lub koob yees duab, qhia tias yog lub kaum sab xis. Yog tias qhov tseeb ntawm qhov pom yog nqaim, cov khoom yuav sai sai tawm ntawm qhov chaw saib, ua rau nws nyuaj rau kev ua raws li cov players. Thaum saib cov kis las nrog ntau qhov ua yeeb yam, tsom iav tsom iav nrog kev pom dav dav yog pom zoo tshwj xeeb. Feem ntau, qhov siab dua qhov kev nthuav dav, qhov nqaim ntawm qhov kev pom tiag tiag dhau los, yog li nws yog qhov zoo dua los xaiv cov tsom iav kom paub qhov loj ntawm cov chaw ntau pob.
