 | This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Film plane" – news ·newspapers ·books ·scholar ·JSTOR(December 2024) (Learn how and when to remove this message) |
Afilm plane is the surface of an image recording device such as a camera, upon which thelens creates thefocused image. In cameras from different manufacturers, the film plane varies in distance from the lens. Thus each lens used has to be chosen carefully to assure that the image is focused on the exact place where the individual frame offilm ordigital sensor is positioned duringexposure. It is sometimes marked on a camera body with the 'Φ' symbol where the vertical bar represents the exact location.
Movie cameras often also have small focus hooks where thefocus puller can attach one side of atape measure to quickly gauge the distance to objects that the operator intends to bring into focus on the film.[1] The measurement is taken from the film plane to the subject and effectively the film plane is the point in the camera where the film sits in the gate.[1] Light measurements can also be taken at the film plane.[2]
Due toPetzval field curvature, the film plane upon which a lens focuses may not be a literal plane. Cameras may bend the film stock or evenplate stock slightly to compensate, improving the area ofcritical focus and sharpness. Nevertheless, the general concept of a focal plane is understood to refer to this position in the camera sensor relative to the lens.
 | This film technology article is astub. You can help Wikipedia byexpanding it. |