For the trained engineer, LumaCon also offers more expert fault analysis tools.
Each LumaCon comes equipped with additional test-patterns and a focal-plane microscope that offer the possibility for analysis of the following lens assembly faults.
1) Spherical abberation: caused by incorrect regulation of air gaps between lens elements or groups.
2) Coma: caused by the decentering of optical parts or components of the lens assembly
3) Astigmatism: caused by pinching optics are pinching, due to uneven mechanical pressure.
Off course combinations of the above can also be detected.
In combination with the Focal-plane microscope the LumaCon can generate a center-weighted resolution reading for comparison of lenses of similar type. It is not intended as an absolute resolution test or a substitute for MTF analysis.
It is most useful as a comparative check in aid of maintaining consistent quality across your lens inventory.