In summary, in order to tilt/decenter an optical element in a sequential optical system:

• Two coordinate break surfaces are usually required, one to perform the compound tilt/decenter and the other to restore the original axis
• The two CB surfaces must be co-located, which is done most easily with a position solve
• The decenters and tilts of the second CB must be the exact reverse of the first CB. This is most easily achieved with pick-up solves
• The order in which decenters and tilts are applied by the second CB must be the reverse of that used by the first. The Order flag is used to achieve this
• The Tilt/Decenter Element Tool is the easiest way to achieve all this in one step, and is strongly recommended.
• Check the results with the Global Vertex section of the Prescription Report to ensure surfaces are placed where you expect them to be.

References

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