focal distance

简明释义

焦距

英英释义

例句

1.The photographer adjusted the lens to achieve the correct focal distance 焦距 for the portrait.

摄影师调整了镜头以达到肖像的正确焦距。

2.In microscopy, the focal distance 焦距 is crucial for obtaining a clear image.

在显微镜中，焦距对于获得清晰图像至关重要。

3.Different lenses have varying focal distances 焦距, affecting the depth of field.

不同的镜头有不同的焦距，影响景深。

4.The focal distance 焦距 of the telescope allows for better observation of distant stars.

望远镜的焦距使得观察遥远的星星变得更好。

5.To ensure sharp focus, the focal distance 焦距 must match the subject's distance from the camera.

为了确保清晰对焦，焦距必须与被摄对象与相机的距离相匹配。

作文

Understanding the concept of focal distance is essential for anyone interested in photography and optics. The term refers to the distance between the lens and the image sensor or film plane when the subject is in focus. This distance plays a crucial role in determining how images are captured and perceived. In simpler terms, focal distance can be thought of as the point at which light rays converge to create a clear image. In photography, different lenses have varying focal distances, which influences their field of view and depth of field. For instance, a lens with a short focal distance is ideal for capturing wide-angle shots, allowing photographers to include more of the scene in their frame. Conversely, a long focal distance lens is better suited for zooming in on distant subjects, making it popular for wildlife or sports photography. Moreover, understanding focal distance helps photographers manipulate the depth of field. A shorter focal distance typically results in a shallower depth of field, which can beautifully blur the background, emphasizing the subject. This effect is often desired in portrait photography, where the goal is to draw attention to the subject's features while softening any distracting elements behind them. On the other hand, a longer focal distance lens increases the depth of field, ensuring that more of the image remains in focus. This is particularly useful in landscape photography, where capturing detail throughout the scene is essential. In addition to its applications in photography, focal distance is also a fundamental concept in optics and physics. It is used to describe how lenses and mirrors focus light, which has implications in various fields such as astronomy and microscopy. In these contexts, understanding focal distance allows scientists to design instruments that can gather light more effectively, improving our ability to observe distant stars or tiny organisms. Furthermore, the concept of focal distance is not limited to just lenses; it also applies to human vision. Our eyes have a natural focal distance that allows us to see objects clearly at certain distances. When we look at something too close or too far away, our eyes must adjust to bring the object into focus, a process known as accommodation. This biological focal distance varies from person to person and can change with age, leading to common issues such as presbyopia, where the ability to focus on close objects diminishes. In conclusion, the term focal distance encompasses a range of meanings across different disciplines. Whether in photography, optics, or even human vision, understanding this concept enhances our ability to capture and perceive the world around us. As technology continues to advance, the principles of focal distance will remain integral to both artistic expression and scientific discovery. Therefore, mastering the idea of focal distance is not only beneficial for photographers but also for anyone looking to deepen their understanding of how we interact with light and images.

理解焦距的概念对于任何对摄影和光学感兴趣的人来说都是至关重要的。这个术语指的是在物体聚焦时，镜头与图像传感器或胶卷平面之间的距离。这一距离在确定图像如何被捕捉和感知方面起着关键作用。简单来说，焦距可以被视为光线汇聚以创建清晰图像的点。在摄影中，不同的镜头具有不同的焦距，这影响了它们的视野和景深。例如，具有较短焦距的镜头非常适合拍摄广角照片，使摄影师能够将更多的场景纳入画面。相反，长焦距镜头更适合对远处的对象进行缩放，因此在野生动物或体育摄影中非常受欢迎。此外，理解焦距有助于摄影师操控景深。较短的焦距通常会导致较浅的景深，这可以美丽地模糊背景，突出主体。这种效果在肖像摄影中常常是所期望的，目标是将注意力集中在主体的特征上，同时柔化背景中任何分散注意力的元素。另一方面，较长的焦距镜头增加了景深，确保图像中的更多部分保持清晰。这在风景摄影中尤其有用，因为捕捉整个场景的细节至关重要。除了在摄影中的应用，焦距也是光学和物理学中的一个基本概念。它用于描述镜头和镜子如何聚焦光线，这在天文学和显微镜等各个领域都有影响。在这些背景下，理解焦距使科学家能够设计出能更有效地收集光的仪器，从而改善我们观察遥远星星或微小生物的能力。此外，焦距的概念不仅限于镜头，它也适用于人类视觉。我们的眼睛具有自然的焦距，使我们能够在某些距离清晰地看到物体。当我们看着太近或太远的东西时，我们的眼睛必须调整以使物体聚焦，这一过程称为调节。这种生物学上的焦距因人而异，并且可能随着年龄的增长而变化，导致常见问题如老花眼，即近距离物体的聚焦能力减弱。总之，焦距这个术语在不同学科中包含了一系列含义。无论是在摄影、光学还是人类视觉中，理解这一概念都增强了我们捕捉和感知周围世界的能力。随着技术的不断进步，焦距的原理将继续在艺术表现和科学发现中发挥重要作用。因此，掌握焦距的概念不仅对摄影师有利，也对任何希望加深对我们如何与光和图像互动的理解的人有益。