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    大光圈会由于焦距的不同而发生改变
    2018/3/26 16:17:18

    我们用一个入门级的变焦镜头作为例子。如这颗佳能18-55mm变焦镜头,镜头前的标识说明这支镜头的最大光圈会由于焦距的不同而发生改变,改变的范围在F/3.5至F/5.6之间。

    We use an example of an entry - level zoom lens. For example, the Canon 18-55mm zoom lens, the logo before the lens shows that the maximum aperture of this lens will change due to the difference of focal length, and the range of change will be between F/3.5 and F/5.6.

    当我们试图找到这只镜头的最佳光圈(指在这个光圈下拍摄的画面能够达到最佳锐度)的时候,我们可以遵循一个国内规律,首先找到这支镜头的最大光圈,然后缩小两级左右,F/7或许就是这支镜头的最佳光圈。

    When we try to find the optimum aperture lens (refer to shoot at this aperture can achieve the best picture sharpness) when we can follow a domestic law, first find the maximum aperture lens, then reduced about two, F/7 is perhaps the best aperture of the lens.

    一是对焦的准确,二是画面的锐度。锐度,有时也被称为“清晰度”,它是反映图像清晰程度和图像边缘锐利程度的一个指标。如果将锐度调高,图像的细节对比也更高,看起来更清楚。比如,在高锐度的情况下,不但画面上人脸的皱纹、斑点更加清楚,而且脸部肌肉的鼓起或凹下也会表现得栩栩如生。

    高考摄影培训

    One is the accuracy of the focus, and the two is the sharpness of the picture. Sharpness, sometimes called "clarity", is an indicator of the degree of clarity of the image and the sharpness of the edge of the image. If the sharpness is raised, the image details are also higher, and it looks clearer. For example, in the case of high acuity, not only the wrinkles and spots on the faces are clearer, but also the facial muscles can be lifelike or concave.

    根据镜头的物理结构,如果想让画面产生很清晰、很锐利的感觉,就要适当的缩小光圈,指针与表盘轮廓分明,钟表的边缘与背景花草的边缘对比也很清晰;左图F/3.5,虽然能形成背景虚化的效果,但是你会发现整个表盘都失去了锐利感,使得指针和表盘似乎黏在了一起。

    According to the physical structure of the lens, if you want the screen is very clear and sharp feeling, will narrow the aperture the pointer and dial clear edge contrast clock edge and background of flowers is very clear; the F/3.5, although the formation of bokeh effect, but you will find the dial have lost the sense of sharp, makes the pointer and dial seemed to stick together.

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    The company serves the customer in all directions, with the high quality, the reasonable price and the perfect after sale service and the customers to advance hand in hand, and develop together. Quality assurance, welcome to consult the negotiation.