在照片洗印及放大中。正确的曝光量是很重要的。尤其是彩色片洗印,因它的曝光量宽容度很小,所以正确的曝光量就更加重要。以往的洗印多采用试样的方法。这种方法很麻烦,要印好一张照片,必须每一张反复曝光冲洗试验才能得到准确的曝光。电子测光定时器可以将所需的曝光量记忆下来 In the photo printing and enlargement. The correct amount of exposure is important. Especially the color film printing, because of its exposure tolerance is small, so the correct exposure is even more important. In the past, many samples were used for printing. This method is very troublesome, to print a good photo, must be repeated exposure to each rinse test in order to get accurate exposure. Electronic metering timer can be the amount of light required to memorize