MetaGlossary.com: Back Focal Length

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Keywords: Vertex, Focal, Lens, Plane, Distance

Related Terms: Fisheye , Eyepiece, Focalize, Focusing, Macro Lens, Magnification, Parfocal, Telephoto, Telephoto Lens, Wide-Angle, Focal Length, Fixed Focal Length, Angle Of View, Depth Of Field, Barlow Lens, Varifocal Lens, Zoom Lens, Wide Angle Lens, Objective Lens, Extension Tubes, Depth Of Focus, Telecentric Lens, Close-Up Lens, Infinity, Focuser, Kellner, Zoom , Focal Plane, Back Focus, Slr, Micro Lens, Mirror Lens, Focal Distance, Fisheye Lens, Fixed Focus, Wide-Angle Lens, Prime Focus, Hyperfocal Distance, Extension Tube, Long Lens, Refracting Telescope, Focal-Plane Shutter, Tlr, Normal Lens, Rangefinder Camera, Deep Focus, Mod, Fixed Lens, Prime Lens, Teleconverter

The distance between the last surface of a lens to its back focal plane.

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As measured on the principal axis, from the second lens vertex to the back focal point of the lens. It is not the equivalent of the focal length.

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The distance from the final surface of an optical system to the focal plane.

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The distance from the surface of the rear-most lens element to the image plane, CCD Sensor Area (video camera) or Film Emulsion (film camera).

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The distance from the vertex of the back surface of a lens to the image of an infinitely distant object.

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