[RGhost]

請問乜野係測光呢
又有乜野用呢
同埋點測光

[tam_dominic]

請問乜野係測光呢
To find out how bright the object is illuminated.

又有乜野用呢
In photography, it is a base to set the exposure time and / or aperture of the camera. The main objective is to make the object properly exposed.
Too much exposure makes the photo become white.
Too little exposure makes the photo black.

同埋點測光
1. Direct metering - check the brightness by placing a brightness meter by / on /beside the object. Most professional use this method.
2. Reflective metering - Check the light reflecting from the object into the camera. All camera use this method and is devided into 'spot' metering,
'centre weight' metering, 'average' metering etc.

Happy shooting !