Does the Total Track length include the distance to the image plane? How does it handle non-axial systems?
Best answer by Sarah.Grabowski
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Total Track is defined as the distance between the vertex of the surface furthest left (minimum z coordinate) and the vertex of the right-most surface (largest z coordinate). In axial systems, this accounts for all surface thicknesses from surface 1 to the image plane.
This definition holds even when being applied to systems that are non-axial. For example, the Total Track length is indicated in red on the diagram below of a singlet followed by a fold mirror, reporting the distance from surface 1 (the stop) to the center of the fold mirror. Thus, this metric has little or no meaning for these types of systems.
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