Focal Plane v. Focus Distance

Started Apr 22, 2013 | Discussions thread
Olaf Ulrich Contributing Member • Posts: 955
Re: Focal Plane and Focus Distance

Chimere wrote:

Remains to have a look at the focal length: which is the distance from the optical center of the lens (when adjusted for infinity) to the focal plane. The optical center of the lens is the theoretical point where incoming light rays converge and cross each other.

This is wrong on several levels. Subject distance just is the distance from the focused-on subject to the image plane (i. e. where the film or sensor is) ... as simple as that.

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