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    Zone Focusing / 區域對焦

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    在有些拍攝條件下沒有時間對焦,區域對焦就是把焦點事前調在動體最可能出現的那一段距離上,以解決來不及對焦的困難。攝影家估計好動體將要進入的中心位置,把焦點調在這個距離上,選好一個光圈,它的景深足夠覆蓋動體可能出現或首先出現的這一範圍。這個區域的任何物體在最後的影像中將具有可接受的清晰度,而用不著再去調焦。鏡筒上的景深表或相機焦點控制機制會提供其光圈在每個距離上聚焦清晰的區域。一個光圈的最大景深在它聚焦於超焦距時,這可以迅速做到:把距離刻度上的無限遠標誌對準所選擇之光圈景深刻度就行。這時景深便包括了從焦點所定距離的一半到無限遠整個區間。有時超焦距區域起點太遠,不能包括所要求的範圍,這叫可選擇近些、範圍更小的區域。有些簡易相機上用圖形標示著聚焦區域,指出特寫、近景、中景和遠景。
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