Focal plane
= Focal plane
A focal plane is a plane in which an optical system forms images of distant directions. Aberrations can make the best-focus surface curved; a flat detector may then require a field-flattening optical element.
= Focal plane
A focal plane is a plane in which an optical system forms images of distant directions. Aberrations can make the best-focus surface curved; a flat detector may then require a field-flattening optical element.