单反机的调焦误差 ,是指光线从镜头的像方节点到胶片乳剂面的距离与由像方节点经过反射镜到取景屏的距离之差。倘若调焦误差太大 ,被拍摄的主体就会模糊 ,那怕调焦时非常仔细也没有用。例如拍摄一朵花 ,虽然对花仔细调焦 ,但结果最清楚的部分不是花 ,而是花前或花后的枝叶。调 SLR focus adjustment error refers to the distance from the image-side node of the lens to the film emulsion side and the distance from the image side node through the mirror to the viewfinder screen. If the focus error is too large, the subject will be blurred, even if the focus is very careful when it is useless. For example, shooting a flower, although the focus on the flower, but the result is not the most clear part of the flower, but before or after flowering foliage. Tune