focal distance

简明释义

焦距

英英释义

例句

1.Adjusting the focal distance can significantly change the perspective of the shot.

调整焦距可以显著改变拍摄的视角。

2.To capture the best details, you must know the focal distance of your camera.

为了捕捉最佳细节，你必须知道相机的焦距。

3.The focal distance determines how far away the subject can be while still in focus.

焦距决定了被摄对象在仍然清晰对焦时可以距离多远。

4.The photographer adjusted the lens to achieve the correct focal distance.

摄影师调整镜头以达到正确的焦距。

5.In microscopy, the focal distance is critical for obtaining a clear image.

在显微镜中，焦距对于获得清晰图像至关重要。

作文

In the world of photography and optics, understanding the concept of focal distance is crucial for achieving the desired results in capturing images. The term focal distance refers to the distance between the lens of a camera and the subject being photographed, where the image is in sharp focus. This distance plays a significant role in determining how much of the scene will be in focus and how the elements within the frame will be rendered. For instance, a shorter focal distance often results in a shallow depth of field, which can beautifully blur the background, allowing the subject to stand out. Conversely, a longer focal distance increases the depth of field, bringing more of the scene into focus, which is particularly useful in landscape photography. Understanding focal distance is not just limited to photography; it is also essential in various fields such as microscopy and astronomy. In microscopy, the focal distance helps to determine how close a specimen can be to the lens while still being clearly visible. Similarly, in astronomy, the focal distance of a telescope affects how well celestial objects can be observed. A greater focal distance allows for higher magnification and clearer images of distant stars and planets.Moreover, the concept of focal distance is deeply intertwined with the principles of optics, which describe how light behaves when it encounters different surfaces. Lenses are designed to bend and refract light, and their focal distance is a key factor in determining how they will perform. For example, a convex lens has a positive focal distance, meaning it converges light rays to a point, while a concave lens has a negative focal distance, causing light rays to diverge. Understanding these concepts allows photographers and scientists alike to manipulate light effectively to achieve their goals.In practical terms, adjusting the focal distance can dramatically change the outcome of a photograph. Photographers often use this knowledge to create artistic effects or to highlight specific details within a scene. For example, portrait photographers might choose a lens with a longer focal distance to create flattering images that minimize distortion and provide a pleasing background blur. On the other hand, a wide-angle lens with a short focal distance can capture expansive landscapes, emphasizing the foreground while keeping the background in focus.In conclusion, the concept of focal distance is fundamental to the art and science of photography, as well as to various scientific disciplines. By mastering the principles surrounding focal distance, individuals can enhance their skills in capturing images and understanding the behavior of light. Whether you are a budding photographer, a seasoned scientist, or simply someone interested in the mechanics of vision, grasping the importance of focal distance will undoubtedly enrich your experience and appreciation of the visual world around you.

在摄影和光学的世界中，理解“焦距”这一概念对于实现拍摄图像所需的效果至关重要。术语“焦距”指的是相机镜头与被拍摄对象之间的距离，在这个距离下，图像处于清晰的焦点。这一距离在决定场景中的多少部分将处于焦点以及框架内的元素如何呈现方面发挥着重要作用。例如，较短的焦距通常会导致浅景深，这可以美丽地模糊背景，使主题更加突出。相反，较长的焦距则增加了景深，使场景中的更多部分处于聚焦状态，这在风景摄影中特别有用。对焦距的理解不仅限于摄影；它在显微镜学和天文学等多个领域同样重要。在显微镜学中，焦距帮助确定标本可以离镜头多近而仍然清晰可见。同样，在天文学中，望远镜的焦距影响观察天体的清晰度。更大的焦距允许更高的放大倍率，从而更清晰地观察遥远的星星和行星。此外，焦距的概念与光学原理密切相关，这些原理描述了光在遇到不同表面时的行为。镜头设计用于弯曲和折射光，而它们的焦距是决定其性能的关键因素。例如，凸透镜具有正焦距，意味着它将光线聚集到一个点，而凹透镜具有负焦距，导致光线发散。理解这些概念使摄影师和科学家能够有效地操控光线，以实现他们的目标。在实际操作中，调整焦距可以显著改变照片的结果。摄影师常常利用这一知识创造艺术效果或突出场景中的特定细节。例如，肖像摄影师可能会选择具有较长焦距的镜头，以创建减小畸变并提供令人愉悦的背景模糊的漂亮图像。另一方面，具有短焦距的广角镜头可以捕捉广阔的风景，强调前景，同时保持背景的清晰。总之，“焦距”的概念是摄影艺术和科学以及各种科学学科的基础。通过掌握围绕焦距的原则，个人可以提高捕捉图像和理解光行为的技能。无论你是一个新手摄影师，一个经验丰富的科学家，还是仅仅对视觉机制感兴趣的人，理解焦距的重要性无疑会丰富你对周围视觉世界的体验和欣赏。