focal length
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. ,Select index from list of EO's own optical substrates to help calculate focal lengths and principal points of any standard lens. Note: This calculator follows the ...
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 focal length 相關參考資料
DSLR Camera Basics | Focal Length and Angle of view
The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lens... https://imaging.nikon.com Focal length - Wikipedia
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. https://en.wikipedia.org Focal Length Calculator | Edmund Optics
Select index from list of EO's own optical substrates to help calculate focal lengths and principal points of any standard lens. Note: This calculator follows the ... https://www.edmundoptics.com Focal Length, Angle of View & Perspective in Photography ...
The focal length of a lens is defined as the distance from its secondary principal point to its rear focal point when focus is set to infinity. The secondary principal ... https://www.sony.com.tw Understanding Camera Zoom & Lens Focal Length | Nikon
The focal length of a lens is determined when the lens is focused at infinity. Lens focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large indiv... https://www.nikonusa.com Understanding Focal Length and Field of View | Edmund Optics
Fixed Focal Length Lenses have the ability to be focused for different distances; Fixed Focus Lenses are intended for use at a single, specific working distance. https://www.edmundoptics.com What is Focal Length in Photography? - Focal Length Explained
2020年4月26日 — The simplest focal length definition is a description of the distance between the center of a lens and the image sensor when the lens is focused at ... https://capturetheatlas.com What Is Focal Length in Photography? - Photography Life
2019年4月29日 — Without getting into an in-depth physics discussion, the focal length of a lens is an optical property of the lens. It measures the distance, in ... https://photographylife.com What is Focal Length? (And Why it Matters in Photography!)
What Does Focal Length Mean? The focal length of the lens determines how 'zoomed in' your photos are. The higher the number, the more zoomed your lens will ... https://expertphotography.com 焦距- 维基百科，自由的百科全书
對厚透鏡（厚度不能忽略的透鏡），或是有好幾片透鏡或面鏡的系統（像是照相機鏡頭或望遠鏡），焦距通常會以有效焦距（EFL，effective focal length）來表示， ... https://zh.wikipedia.org |