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根据自动聚焦感应器的情况，目前的单反相机自动聚焦可分为三个档次：1．简单的单一中央AF感应器（取景器内的AF感应区由一个小的矩形或方括弧来确定）。2．覆盖画面中较大区域的比较先进的多重感应器（采用多重取景矩形或放大的中央取景感应区或取景器内的方括弧）。3．最先进
According to the situation of autofocus sensor, the current SLR camera autofocus can be divided into three grades: 1. A simple single central AF sensor (AF sensing area in the viewfinder is determined by a small rectangle or square brackets). 2. More advanced multi-sensor that covers a large area of the frame (using multi-view rectangle or enlarged center view sensing area or square bracket in viewfinder). 3. Most advanced