攝影專用名詞.當無限遠的平行光線進入照相機鏡頭時,光線就會向透鏡主軸折射而聚成一點,這個會聚點就是鏡頭的焦點,亦即鏡頭所攝景物結像的最清晰點.由鏡頭的主焦點和眾多的副焦點構成的垂直於主軸的平面稱為焦平面.照相機內安裝感光片的地方就是處在焦平面位置上.
Photo special terms.Whenthe infinity of parallel light entering camera lens, the light will be refracted to the lensaxis, forming a little while, this convergence point is the focus of the lens, which is the lens of the photo scene such as the clearest point of junction. from the camera's main focus and the focus of a large number of deputy posed perpendicular to the axis of the plane known as the focal plane. Ganguang Pian where the camera is installed at the focal plane position.