Pengukur cahaya: Perbedaan antara revisi
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Untuk mendapatkan detail tertentu secara maksimal, digunakan spot metering. Bagian yang diabaikan mendapatkan pengukuran yang salah sehingga detailnya akan menghilang.
[[image:Swiatlomierz1968rok-Leningrad4.jpg|130px|thumb|left|Amateur analog light meter ([[1968]], [[USSR]])]]▼
[[Image:Autoexpmeter.JPG|thumb|130px|left|An automatic light meter/exposure unit from an [[8 mm]] [[movie camera]], based on a galvanometer mechanism (center) and a [[Cadmium sulfide|CdS]] [[photoresistor]], in opening at left.]]▼
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▲[[image:Swiatlomierz1968rok-Leningrad4.jpg|130px|thumb|left|Amateur analog light meter ([[1968]], [[USSR]])]]
▲[[Image:Autoexpmeter.JPG|thumb|130px|left|An automatic light meter/exposure unit from an [[8 mm]] [[movie camera]], based on a galvanometer mechanism (center) and a [[Cadmium sulfide|CdS]] [[photoresistor]], in opening at left.]]
Selenium and silicon light meters use sensors that are [[photovoltaic]]. These sensors generate a voltage proportional to light exposure. Selenium sensors generate enough voltage for direct connection to a meter. Silicon sensors need an amplification circuit and require a power source like a [[battery (electricity)|batteries]] to operate. CdS light meters use a sensor based on [[photoresistance]]. These also require a battery to operate. Most modern light meters use silicon or CdS sensors. They indicate the exposure either with a needle [[galvanometer]], or on a [[LCD]] screen.
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