笔者在勘查一入室盗窃案现场时,发现镜面上遗留有两枚汗液指纹,由于水银的反光,纹线出现双影,而其它物体的影像也映在其中,且又不能配光,影响拍照.经实验,采用散光脱影法,既便于观察,也使拍照取得了理想效果. When I surveyed the scene of a burglary case, I found two perspiration fingerprints left on the mirror surface. Due to the reflection of mercury, the double lines appear on the lines and the images of other objects are also reflected in them. The experiment, the use of astigmatism off method, both for observation, but also make the camera achieved the desired effect.