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Light meter
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===Cameras with internal meters=== Calibration of cameras with internal meters is covered by [[#CITEREF ISO2721:1982|ISO 2721:1982]]; nonetheless, many manufacturers specify (though seldom state) exposure calibration in terms of <math>K</math>, and many calibration instruments (e.g., Kyoritsu-Arrowin multi-function camera testers<ref>Specifications for Kyoritsu testers are available on the [http://www.criscam.com/ C.R.I.S. Camera Services] web site under "kyoritsu test equipment."</ref> ) use the specified <math>K</math> to set the test parameters.
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