A range in relation to an optical system, such as a camera lens, representing distances great enough that light rays reflected from objects within the range may be regarded as parallel. (聚焦區)無限遠與光學系統(如照像鏡頭)有關的一個範圍，表示距離是如此之遠，以至於從在這一距離的物體上反射回來的光可以視為平行光線
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