Koj lub tsom iav tsom iav qhov chaw saib yog qhov dav ntawm thaj chaw koj tuaj yeem pom. Nws yog feem ntau piav nyob rau hauv ob txoj kev: angular field of view thiab linear field of view.
Angular field of view yog lub kaum ntse ntse pom los ntawm optics thiab feem ntau yog ntsuas hauv degrees. Txoj kab uas hla ntawm qhov pom yog qhov dav ntawm thaj chaw pom thiab muab hauv ko taw pom ntawm 1000 yds. Tus lej loj dua rau lub kaum sab xis lossis kab tawm ntawm qhov pom txhais tau tias koj pom thaj chaw loj dua.
Angular field of view tuaj yeem siv los xam cov kab tawm ntawm qhov pom: tsuas yog muab cov angular teb los ntawm 52.5. Piv txwv li, yog hais tias lub angular teb ntawm ib tug tshwj xeeb binocular yog 8 degree, ces linear teb ntawm 1000 yds yuav 420 ft (8 x 52.5).
Qhov kev pom muaj feem cuam tshuam nrog kev nthuav dav. Nyob rau hauv dav dav, ib tug ntau dua magnification yields ib tug me me qhov chaw ntawm view. Qhov chaw loj ntawm kev pom yog qhov tshwj xeeb tshaj yog xav tau nyob rau hauv cov xwm txheej cuam tshuam nrog kev txav, xws li cov noog hauv davhlau lossis thaum koj nyob hauv nkoj lossis hauv tsheb.
