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I believe I now see the confusion (sorry, slow on the uptake). Most lens and imaging diagrams do indeed give the impression that all the light comes to a point at the focus point, it's even in the name. However that's not what is actually happening. The smallest point of light is actually an image, not a point. The focal length of a lens refers to the fixed ...


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When talking about light converging on the image plane in photography, we're talking about light from a particular point in the camera's field of view converging at the plane that contains the film or digital imaging sensor. In photography, this plane is called the focal plane or image plane. In the scientific field of optical physics, the terms focal plane ...


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"because if the focal point, the point as I understand it to be where all the light converges, was on the film plane, an image wouldn't be rendered, it would just be an indistinguishable point of light." This understanding is incorrect... at all points on an objective lens exists all of the light required to form an mage (a portion of the total). ...


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The focal length of a lens is a measurement taken when the lens is imaging a far distance object like a star. If the lens structure is a single symmetrical (convex – convex) then this measurement is taken from the center of the lens to the focused image. A distant object is at an infinite distance when its light rays arrive at the camera lens as a bundle of ...


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