Hi, I was wondering why we need to assume that the focus distance of the lens camera is equal to the focal length of the pinhole camera. In class we discussed that a pinhole camera with the aperture at the focal point of a lens camera, ie where the light will intersect in a lens camera as shown on the previous slide will produce an equivalent image to the lens camera. In other words pinhole cameras and lens cameras with equivalent focal lengths will be equal.
motoole2
In the context of pinhole cameras, focal length refers to the distance of the sensor from the pinhole. In the context of lens cameras, focal length refers to the distance where parallel rays focus to a point. These two definitions for focal length are not equivalent, and the statement "pinhole cameras and lens cameras with equivalent focal lengths will be equal" is not correct in general.
Focus distance describes the position of the sensor relative to the lens, and is analogous to the focal length of a pinhole camera. So when we say that "we assume that the focus distance of the lens camera is equal to the focal length of the pinhole camera", we are simply stating that the sensor is at the same distance from the lens/pinhole.
Hi, I was wondering why we need to assume that the focus distance of the lens camera is equal to the focal length of the pinhole camera. In class we discussed that a pinhole camera with the aperture at the focal point of a lens camera, ie where the light will intersect in a lens camera as shown on the previous slide will produce an equivalent image to the lens camera. In other words pinhole cameras and lens cameras with equivalent focal lengths will be equal.
In the context of pinhole cameras, focal length refers to the distance of the sensor from the pinhole. In the context of lens cameras, focal length refers to the distance where parallel rays focus to a point. These two definitions for focal length are not equivalent, and the statement "pinhole cameras and lens cameras with equivalent focal lengths will be equal" is not correct in general.
Focus distance describes the position of the sensor relative to the lens, and is analogous to the focal length of a pinhole camera. So when we say that "we assume that the focus distance of the lens camera is equal to the focal length of the pinhole camera", we are simply stating that the sensor is at the same distance from the lens/pinhole.
(All a bit confusing.. I know..)