aperture ratio

简明释义

孔径比

英英释义

例句

1.A higher aperture ratio allows for better low-light performance in photography.

更高的光圈比可以在摄影中提供更好的低光性能。

2.The aperture ratio of a telescope determines its ability to gather light.

望远镜的光圈比 决定了其收集光线的能力。

3.In optics, the aperture ratio affects the depth of field in an image.

在光学中，光圈比 会影响图像的景深。

4.The aperture ratio is crucial in determining the amount of light that enters the camera.

在确定进入相机的光线量时，光圈比 是至关重要的。

5.Engineers often calculate the aperture ratio to optimize lens design.

工程师通常计算光圈比以优化镜头设计。

作文

In the world of optics and photography, the term aperture ratio refers to the relationship between the diameter of the lens opening and the focal length of the lens. This concept is crucial for photographers and optical engineers alike, as it directly influences the amount of light that reaches the camera sensor or film. A higher aperture ratio means a larger opening, allowing more light to enter, which can be particularly beneficial in low-light conditions. Conversely, a lower aperture ratio indicates a smaller opening, resulting in less light, which may necessitate longer exposure times or higher ISO settings to achieve a properly exposed image.Understanding the aperture ratio is essential not only for capturing images but also for controlling depth of field. Depth of field refers to the range of distance within a photo that appears acceptably sharp. A large aperture ratio (or a wide aperture) produces a shallow depth of field, which is often desired for portraits where the subject is in focus while the background is blurred. This effect isolates the subject and creates a pleasing aesthetic. On the other hand, a small aperture ratio increases the depth of field, making it ideal for landscape photography, where both the foreground and background need to be in focus.The aperture ratio is typically expressed in f-stops, with common values including f/1.4, f/2.8, f/5.6, and so on. Each full stop change represents a doubling or halving of the amount of light entering the lens. For example, moving from f/2.8 to f/2.0 doubles the light, while moving from f/5.6 to f/8.0 halves it. This system allows photographers to easily calculate exposure settings and understand how changes in the aperture ratio will affect their images.Moreover, the aperture ratio also plays a significant role in the overall quality of an image. Different lenses have different optimal aperture ratios, where they perform best in terms of sharpness and contrast. For instance, many lenses are sharpest at around f/8, while wider apertures might introduce some softness due to optical aberrations. Photographers often experiment with various aperture ratios to find the perfect balance between light intake and image quality.In conclusion, the concept of aperture ratio is fundamental in the fields of photography and optics. It influences not just the exposure of an image but also its artistic qualities, such as depth of field and sharpness. By mastering the aperture ratio, photographers can enhance their ability to capture images that are not only well-exposed but also visually compelling. Understanding this concept allows for greater creative control and the ability to adapt to varying shooting conditions, ultimately leading to better photography outcomes.

在光学和摄影的世界中，术语光圈比率指的是镜头开口直径与镜头焦距之间的关系。这个概念对摄影师和光学工程师来说都至关重要，因为它直接影响到到达相机传感器或胶卷的光线量。较高的光圈比率意味着更大的开口，允许更多的光进入，这在低光条件下尤其有利。相反，较低的光圈比率表示更小的开口，导致光线减少，这可能需要更长的曝光时间或更高的ISO设置来实现正确曝光的图像。理解光圈比率不仅对捕捉图像至关重要，还能控制景深。景深是指照片中看起来清晰的距离范围。较大的光圈比率（或宽光圈）产生浅景深，这通常是拍摄人像时所期望的效果，在这种情况下，主体清晰而背景模糊。这种效果将主体与背景分离，创造出令人愉悦的美感。另一方面，较小的光圈比率增加了景深，使其非常适合风景摄影，在这种情况下，前景和背景都需要保持清晰。光圈比率通常以f-stop表示，常见值包括f/1.4、f/2.8、f/5.6等。每个完整的停止变化表示进入镜头的光量加倍或减半。例如，从f/2.8移动到f/2.0会使光线加倍，而从f/5.6移动到f/8.0则会使光线减半。这个系统使摄影师能够轻松计算曝光设置，并理解光圈比率的变化将如何影响他们的图像。此外，光圈比率在图像整体质量中也起着重要作用。不同的镜头具有不同的最佳光圈比率，在锐度和对比度方面表现最佳。例如，许多镜头在大约f/8时最为锐利，而较大的光圈可能因光学像差而引入一些柔和感。摄影师经常尝试各种光圈比率，以找到光线摄入和图像质量之间的完美平衡。总之，光圈比率的概念在摄影和光学领域是基础性的。它不仅影响图像的曝光，还影响艺术特性，如景深和锐度。通过掌握光圈比率，摄影师可以增强捕捉既曝光良好又视觉引人注目的图像的能力。理解这个概念使摄影师能够更好地控制创作，并能够适应不同的拍摄条件，最终带来更好的摄影成果。