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什么是对焦点?什么是景深?在进行拍摄时,调节相机镜头,使距离相机一定距离的景物清晰成像的过程,叫做对焦,而被摄景物所在的点称为对焦点。焦点前(靠近相机)、后一定距离内的景物是清晰的,这个前后清晰的范围就叫做景深。景深的大小首先与镜头焦距有关:焦距长,景深小,反之,景深大。其次,景深与光圈有关:光圈越小(光圈值越大,光圈越小)景深就越大;反之,景深就越小。什么是光学变焦?什么是数码变焦?
What is the focus? What is the depth of field? When shooting, adjust the camera lens, so that the distance from the camera clearly the process of imaging a scene, called the focus, and the scene is called the object point of focus. Before the focus (near the camera), after a certain distance within the scene is clear, clear range before and after this is called depth of field. The depth of field first with the focal length of the lens: long focal length, depth of field is small, on the contrary, the depth of field. Second, the depth of field is related to the aperture: the smaller the aperture (the larger the aperture, the smaller the aperture) the greater the depth of field; the other hand, the smaller the depth of field. What is optical zoom? What is digital zoom?