3/28/2024 0 Comments Contax 645 back focus distance![]() ![]() In order to produce an adaptor that permits focus to infinity without corrective optics, the flange-to-film distance the lens is designed for must be greater than that of the camera body it is to be adapted to, giving room for the adaptor. ![]() This distance influences whether a lens from one system can be mounted with an adaptor to a camera body of another system. ![]() The range of this distance which will render an image clearly in focus within all focal lengths is usually measured in hundredths of millimeters and is known as the depth of focus (not to be confused with the similarly named depth of field). This value is different for different camera systems. Diagram Illustrating the Flange Focal length of an SLR–type and a mirrorless–type cameraįor an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), or register, depending on the usage and source) of a lens mount system is the distance from the mounting flange (the metal ring on the camera and the rear of the lens) to the film plane. ![]()
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