Does the Total Track length include the distance to the image plane? How does it handle non-axial systems?
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Total Track definition
Best answer by Sarah.Grabowski
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.
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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