Focal length - Wikipedia
网页The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.
What Is Focal Length in Photography? A Beginner's Guide
网页2023年9月18日 · The exact definition is: Focal length measures the distance, in millimeters, between the “nodal point” of the lens and the camera’s sensor. “Nodal point” may sound complicated, but it is simply the point where light converges in a lens. Here’s a simple diagram showing the focal length of a lens, based upon this definition:
Understanding Focal Length - Nikon USA
网页Focal length controls the angle of view and magnification of a photograph. Learn when to use Nikon zoom and prime lenses to best capture your subject.
focus distance与focal length的区别？ - 知乎
网页2015年4月17日 · focal length就是焦距。平行光通过理想薄棱镜以后，会聚焦到一个点，这个点就是焦点。从棱镜到焦点的距离，就是焦距。对一个已经做好的棱镜，焦距是不能改变的(现代的棱镜组可以达到改焦距的效果)。 focus distance又是什么呢？
What is Focal Length in Photography? Understanding Lenses
网页Learn how the focal length of your lens affects every image you take, how to choose the right focal length, and why it’s such an important topic in photography.
Basic Photography 101: Understanding Focal Length in Camera …
网页2021年9月3日 · The focal length of a lens determines what your camera can focus on, and how your images are going to turn out. From selecting the right lens, to getting those picture-perfect shots, read on to learn more about focal length and how it impacts photography.
Understanding Focal Length and Field of View | Edmund Optics
网页The focal length of a lens is a fundamental parameter that describes how strongly it focuses or diverges light. A large focal length indicates that light is bent gradually while a short focal length indicates that the light is bent at sharp angles.
What is lens focal length in photography? - Adobe
网页Understanding what focal length is and what it isn’t. When you use a camera lens with a short focal length, such as 18mm, your resulting photo has a wider angle of view. Lenses with longer focal lengths, such as 200mm, give you narrower angles of view.
What is focal length? - beginner's guide - Adobe
网页Understanding what focal length is and what it isn’t. When you use a camera lens with a short focal length, such as 18 mm, your resulting photo has a wider angle of view. Lenses with longer focal lengths, such as 200 mm, give you narrower angles of view.
What is focal length in photography? | Digital Camera World
网页2024年1月11日 · So what exactly is focal length, then? Well, the focal length of a given lens is an optical measurement, not a physical one. It describes the distance between the sensor (or film) inside your camera and the point at which the rays of light converge once they’ve entered the lens.
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