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    介绍一下相机的景深
    2015/11/17 11:12:51
    济南艺考摄影培训学校简单介绍一下相机的景深:
    Jinan arts training school take an examination of photography brief introduction of the depth of field of the camera:
    景深是指在摄影机镜头或其他成像器前沿能够取得清晰图艺考摄影培训像的成像所测定的被摄物体前后距离范围。在聚焦完成后,在焦点前后的范围内都能形成清晰的像,这一前一后的距离范围,便叫做景深。在镜头前方(调焦点的前、后)有一段一定长度的空间,当被摄物体位于这段空间内时,其在底片上的成像恰位于焦点前后这两个弥散圆之间。被摄体所在的这段空间的长度,就叫景深。换言之,在这段空间内的被摄体,其呈现在底片面的影象模糊度,都在容许弥散圆的限定范围内,这段空间的长度就是景深。
    Depth of field refers to the camera lens or other imager frontier can get clear figure art photography training as the imaging test before and after the determination of the subject of object distance range. In focus is completed, within the scope of the before and after the focus can be clear like formation, the tandem distance range, it is called the depth of field. At the front of a camera (adjustable focus before and after) for a certain length of space, when the object is located in the space, the focus in the image on the film just between the two dispersion round before and after. Your subject in the length of the space, is called the depth of field. In other words, in the space of your subject, to the film surface image fuzzy degrees, are permissible dispersion round limit range, the space length is the depth of field.
    所谓景深,就是当焦距对准某一点时,其前后都仍可清晰的范围。它能决定是把背景模糊化来突出拍摄对象,还是拍出清晰的背景。我们经常能够看到拍摄花、昆虫等的照片中,将背景拍得很模糊(称之为小景深)。但是在拍摄纪念照或集体照,风景等的照片一般会把背景拍摄得和拍摄对象一样清晰(称之为大景深)。详细解释:当相机的镜头对着某一物体聚焦清晰时,在镜头中心所对的位置垂直镜头轴线的同一平面的点都可以在胶片或者接收器上相当清晰的图像,在这个平面沿着镜头轴线的前面和后面一定范围的点也可以结成眼睛可以接受的较清晰的像点,把这个平面的前面和后面的所有景物的距离叫做相机的景深。
    A depth of field is when the focal length aim at a certain point, the scope of its before and can still be clear. It can decide whether the background blur to highlight the subject, or take a clear background. We often can see the photos of flowers, insects, such as, the background was very fuzzy (called small depth of field). But in the group photos or landscapes photos usually taken the background as clear as the subject (called a large depth of field). Detailed explanation: when the camera's lens is in focus on an object is clear, for the position in the center of the lens from the same point in the plane of the vertical axis of the lens can be quite clear images in a film or a receiver, in the plane along the axis of the lens in front of and behind a range of points can also form a eyes can accept more clear image point, the distance of all objects in the front and rear of the plane is called the depth of field of the camera.
    光轴平行的光线射入凸透镜时,理想的镜头应该是所有的光线聚集在一点后,再以锥状扩散开来,这个聚集所有光线的一点,就叫做焦点。在焦点前后,光线开始聚集和扩散,点的影像变成模糊的,山东艺考摄影培训形成一个扩大的圆,这个圆就叫做弥散圆。
    Optical axis parallel light into convex lens, the ideal lens should be gathered in all the light a bit, then spread to the cone, the gathered all the light point, is called the focus. Began to gather and diffusion, in before, during and after the focus light into a fuzzy point of the image, shandong art photography training test form an expanding circle, the circle is called dispersion circle.
    在现实当中,观赏拍摄的影像是以某种方式(比如投影、放大成照片等等)来观察的,人的肉眼所感受到的影像与放大倍率、投影距离及观看距离有很大的关系,如果弥散圆的直径大于人眼的鉴别能力,在一定范围内实际影象产生的模糊是不能辨认的。这个不能辨认的弥散圆就称为容许弥散圆(permissible circle of confusion)。在焦点的前、后各有一个容许弥散圆。以持照相机拍摄者为基准,从焦点到近处容许弥散圆的的距离叫前景深,从焦点到远方容许弥散圆的距离叫后景深。
    In reality, watch the film image in some way (such as projection, enlarged photographs, etc.) to observe, felt by the human eye imaging and magnification, projection distance and viewing distance has a lot to do, if the dispersion of the diameter of the circle is greater than the human eye to identify ability, within a certain range of the actual image blur is not recognizable. This can't identify the dispersion of circle is called allow dispersion circle (permissible circle of confusion). In the focus of the before and after each have a permit dispersion circle. To hold the camera the photographer as a benchmark, the distance from the focus to the nearby allow dispersion round called prospect depth, the distance from the focus to a distant allow dispersion circle is called after the depth of field.