關於數碼相機橾作問題

首先在說明書中確認你的相機是能調教光圈、快門，如能夠的話說明書中會有寫不同數值的光圈快門有何不同效果(有些機根本不能調教)。
iso值高時，等於以前用高度數菲林，一般人的用法是能在暗點的地方獲得較高快門，或令閃燈能令較遠的主體正常曝光。

人面反光有一些方法可解決:
1)不用閃燈
2)面油多，要化化妝或洗個面先影

When you take photos, you need to use 快門，光圈, but no standard formula for you. 快門，光圈 also have their only format, 快門 1/60, 1/50, 1/40, 1/6000 etc... 光圈 f1.4, f2, f2.8, f3.6, f4.5... etc if the photos taking at 快門 1/100，光圈 f.8 ISO 感光度100, when the area will be bit dark later, you make need 1/80, f6.4 ISO 100, more darker, 1/60 f3.6 ISO 200 ... for the above sample, may be also take the most same photos. that mean all have relationshop. But the point is, normal DC you cannot change 快門，光圈, is only can apply for prosumer dc or DSLR (change lens digital camera). Of he the price is more expensive.
Why 影出來的人面部經常反光, it may be the photo over, try to change the 快門 speed higher or change ISO lower if possible. Or don't use flash.

白平衡 - White Balance... this can change the photos color tempeture, any where have diff, that why you have to see the area, something you have to change as indoor, outdoor, sunshine, light... etc.. otherwise, you may get the wrong photos color difference that what exactly you are...

Hope this help!!