focal distance

简明释义

焦点距离

英英释义

例句

1.The lens has a variable focal distance which allows for different perspectives.

该镜头具有可变的焦距，允许不同的视角。

2.In microscopy, the focal distance determines how clearly you can see the specimen.

在显微镜中，焦距决定了你能多清楚地看到样本。

3.Adjusting the focal distance can dramatically change the composition of a photo.

调整焦距可以大幅改变照片的构图。

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

摄影师调整了相机以达到正确的焦距。

5.Understanding focal distance is crucial for capturing sharp images.

理解焦距对于拍摄清晰图像至关重要。

作文

Understanding the concept of focal distance is essential in various fields, especially in photography and optics. The term focal distance refers to the distance between the lens of a camera or optical instrument and the point where light rays converge to form a clear image. This distance is crucial in determining how objects are captured and represented in a photograph. In essence, the focal distance plays a significant role in influencing the composition and depth of field in an image.In photography, the focal distance affects not just the clarity of the subject but also the background blur, known as bokeh. A shorter focal distance allows for a wider angle of view, which can be beneficial for landscape photography, capturing expansive scenes with multiple elements. On the other hand, a longer focal distance is often used for portrait photography, where isolating the subject from the background creates a more intimate and focused representation.Moreover, understanding focal distance is vital for photographers when selecting lenses. Different lenses come with varying focal distances, which dictate their suitability for specific types of photography. For instance, a 50mm lens has a standard focal distance that closely resembles human vision, making it ideal for general photography. In contrast, a 200mm lens provides a longer focal distance, suitable for capturing distant subjects without compromising detail.In addition to photography, the concept of focal distance is also applicable in scientific fields such as microscopy and astronomy. In microscopy, the focal distance determines how close the lens needs to be to the specimen to achieve a sharp image. In astronomy, telescopes utilize focal distance to gather light from distant stars and planets, allowing for clearer observations of celestial bodies.Furthermore, the manipulation of focal distance can create artistic effects in photography. Photographers often experiment with varying focal distances to achieve unique perspectives and compositions. By playing with focal distance, they can create images that evoke different emotions and responses from viewers. For example, a close-up shot with a shallow focal distance can produce a sense of intimacy, while a wide shot with a greater focal distance can convey a feeling of vastness.In conclusion, the understanding of focal distance is not merely a technical aspect of photography; it is an integral part of visual storytelling. Whether one is a professional photographer or an amateur enthusiast, mastering the use of focal distance can greatly enhance the quality of their images. Through the careful consideration of focal distance, photographers can craft compelling narratives and share their unique perspectives with the world. Thus, the significance of focal distance extends beyond just optics; it is a bridge between technology and creativity, shaping how we perceive and capture the world around us.

理解焦距的概念在多个领域中至关重要，尤其是在摄影和光学中。术语焦距指的是相机或光学仪器的镜头与光线汇聚形成清晰图像的点之间的距离。这一距离对于确定物体如何被捕捉和表现于照片中至关重要。从本质上讲，焦距在影响图像的构图和景深方面起着重要作用。在摄影中，焦距不仅影响主体的清晰度，还影响背景模糊，称为散景。较短的焦距允许更广的视角，这对风景摄影非常有利，可以捕捉到包含多个元素的广阔场景。另一方面，较长的焦距通常用于人像摄影，其中将主体与背景隔离，创造出更亲密和集中的表现。此外，了解焦距对于摄影师选择镜头至关重要。不同的镜头具有不同的焦距，决定了它们适合特定类型摄影的能力。例如，50mm镜头的标准焦距与人类视觉相似，适合一般摄影。相比之下，200mm镜头提供了更长的焦距，适合捕捉远处的对象而不损失细节。除了摄影，焦距的概念在显微镜学和天文学等科学领域也适用。在显微镜学中，焦距决定了镜头需要与标本多近才能获得清晰图像。在天文学中，望远镜利用焦距从遥远的星星和行星收集光线，从而允许对天体进行更清晰的观察。此外，操控焦距可以在摄影中创造艺术效果。摄影师经常尝试不同的焦距以实现独特的视角和构图。通过玩弄焦距，他们可以创造出唤起不同情感和反应的图像。例如，使用较浅焦距的特写镜头可以产生亲密感，而使用较大焦距的广角镜头可以传达广阔的感觉。总之，理解焦距不仅仅是摄影的技术方面；它是视觉叙事的重要组成部分。无论是专业摄影师还是业余爱好者，掌握焦距的使用都能极大提升他们图像的质量。通过仔细考虑焦距，摄影师可以创作引人入胜的叙事，并与世界分享他们独特的视角。因此，焦距的重要性超越了光学；它是技术与创造力之间的桥梁，塑造了我们如何感知和捕捉周围世界。