测光的 photometric
光度测定的 photometric
光谱测定的 spectrometric
荧光测定的 fluorimetric
用激光的测量 surveying by laser
颜色和光的测量 Colours and measurement of light
折光指数的测定 determination of refractive index
光通量的测量方法 The measurement of luminous flux
不透光性的测定 Determination of opacity
旋光度的测定 Determination of optical rotation
人类可见的物质只占到整个宇宙总物质的17%，剩下的83%是所谓“暗的”，意味着它们不会释出或反射可测光。
The matter we can see makes up just 17% of matter in the Universe; the remaining 83% is "dark", meaning it does not reflect or emit detectable light.
不幸的是，许多内置测光器最多在30秒左右就变得不太精确了。
Unfortunately, most in-camera light meters become inaccurate or Max out at about 30 seconds.
相机的测光方式要设置在局部测光或点测光方式，测光点对着你想要锁定曝光值的目标，按下锁定钮。
To make this work, use the partial metering mode (or spot metering mode) over the subject where you want to lock the flash output then press the asterisk (*) button.
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