[kiros713]

我知iso係感光度
但又唔知有乜野用
上網睇人地d相有iso 100/200/400
但張張又好似差唔多咁
請問可唔可以解釋下呢?

thanks~

[tunster]

This setting has been adopted from film cameras. It refers to the film's sensitivity to light. Higher ISO speeds are needed to take pictures in worse lighting conditions, however they also cause an increased amount of noise. 100 ISO is the default. At 400 ISO the noise is easily detectable on most cameras.

[micros]

http://content.edu.tw/vocation/art/ks_hc/htm/content/ch17/New_Pages/exposure_1.html