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
佳能的E - TTL II甚至可以测出相机和主要被摄对象间的距离并将此作为测光的考虑因素之一。
Canon's E-TTL II even measures the distance to the main subject and that also becomes part of the evaluation taking place.
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.
通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
应用推荐