curvature of field

简明释义

1. 场曲率; 2. 场变曲度; 3. 像场弯曲; 4. 象场弯曲;

英英释义

例句

1.In optical design, understanding the curvature of field is essential for creating high-quality lenses.

在光学设计中，理解场曲率对于创建高质量镜头至关重要。

2.The photographer adjusted the lens to minimize the curvature of field in the final image.

摄影师调整镜头以最小化最终图像中的场曲率。

3.The curvature of field can lead to distortion in wide-angle photographs.

在广角照片中，场曲率可能导致失真。

4.To achieve sharp focus across the entire frame, the curvature of field must be corrected.

为了在整个画面上实现清晰的对焦，必须校正场曲率。

5.Many modern cameras have features that help reduce the effects of curvature of field.

许多现代相机具有帮助减少场曲率影响的功能。

作文

The concept of curvature of field is a crucial aspect in the realm of optics and photography. It refers to the phenomenon where the image produced by a lens or mirror is not perfectly flat, but instead exhibits some degree of curvature. This can lead to various optical aberrations that affect the sharpness and clarity of an image. Understanding the curvature of field is essential for photographers and optical engineers alike, as it directly impacts the quality of the images captured through lenses.In photography, when a lens is designed, it is often optimized for a flat field of focus. However, due to the inherent properties of lenses, especially wide-angle and telephoto lenses, there may be a noticeable curvature of field. This means that while the center of the image may be in sharp focus, the edges may appear blurred or distorted. For instance, when photographing landscapes, a photographer may notice that the foreground is crisp, but the distant mountains seem less defined. This is a direct result of the curvature of field effect.To illustrate this further, consider a scenario where a photographer is using a prime lens with a wide aperture. The lens may produce stunning images at the center, but as the photographer tries to capture a scene that includes both close and far subjects, the curvature of field becomes evident. The photographer must then make a choice: either focus on the foreground and risk losing detail in the background or attempt to find a compromise that may leave both areas slightly out of focus.Optical designers have developed various techniques to minimize the effects of curvature of field. One common approach is to use aspherical lens elements, which help to correct the curvature and provide a more uniform focus across the entire image. Additionally, multi-element lens designs can also aid in reducing these aberrations, leading to better overall image quality.Moreover, understanding the curvature of field can also enhance a photographer's creative choices. By intentionally using a lens that exhibits this characteristic, a photographer can create images with a distinct artistic style. For example, portrait photographers might choose a lens with noticeable curvature of field to achieve a dreamy, soft background while keeping the subject’s face sharply in focus. This selective focus can add depth and dimension to the photograph, drawing the viewer’s attention to the subject.In conclusion, the curvature of field is an important factor in both the technical and artistic aspects of photography. By being aware of its effects, photographers can make informed decisions about their equipment and techniques, ultimately enhancing the quality of their work. Whether striving for precision in landscape photography or seeking to evoke emotion in portraits, understanding the curvature of field allows for greater control over the final image. As technology continues to advance, the ways in which we can manage and utilize this phenomenon will only expand, providing exciting opportunities for both amateur and professional photographers alike.

“场曲率”这一概念在光学和摄影领域中是一个至关重要的方面。它指的是由透镜或镜子产生的图像并不是完全平坦的，而是表现出一定程度的曲率。这可能导致各种光学像差，影响图像的清晰度和清晰度。理解“场曲率”对摄影师和光学工程师来说都是必不可少的，因为它直接影响通过透镜捕捉的图像质量。在摄影中，当设计透镜时，通常会优化为平坦的聚焦面。然而，由于透镜的固有特性，尤其是广角和长焦透镜，可能会出现明显的“场曲率”。这意味着虽然图像的中心可能处于清晰聚焦状态，但边缘可能显得模糊或扭曲。例如，当拍摄风景时，摄影师可能会注意到前景清晰，但远处的山脉似乎不太清晰。这直接是“场曲率”效应的结果。进一步说明这一点，考虑一个摄影师使用大光圈定焦镜头的场景。该镜头在中央可能会产生惊艳的图像，但当摄影师试图捕捉包含近景和远景的场景时，“场曲率”就变得显而易见。摄影师必须做出选择：要么专注于前景，冒着失去背景细节的风险，要么尝试找到一个妥协，可能使两个区域都稍微失焦。光学设计师已经开发出多种技术来最小化“场曲率”的影响。一个常见的方法是使用非球面透镜元件，这有助于校正曲率，并在整个图像上提供更均匀的聚焦。此外，多元素镜头设计也可以帮助减少这些像差，从而提高整体图像质量。此外，理解“场曲率”还可以增强摄影师的创意选择。通过故意使用表现出这种特性的镜头，摄影师可以创造出具有独特艺术风格的图像。例如，人像摄影师可能选择一款具有明显“场曲率”的镜头，以实现梦幻般的柔和背景，同时保持主体的面部清晰可见。这种选择性聚焦可以为照片增添深度和维度，吸引观众的注意力。总之，“场曲率”是摄影技术和艺术方面的重要因素。通过意识到其影响，摄影师可以对设备和技术做出明智的选择，从而最终提升作品的质量。无论是在风景摄影中追求精确，还是在肖像中寻求情感，通过理解“场曲率”，摄影师可以对最终图像有更大的控制权。随着技术的不断进步，我们管理和利用这一现象的方式只会不断扩大，为业余和专业摄影师提供激动人心的机会。