Question
"The " User Surface(U)>> User Ray Trace" option does not appear as an option in the SPECIAL column popup list for surface 1 in the Surface Data Spreadsheet. This appears to be the case for all lenses. Why?"
Synopsis
User ray trace surface option not allowed for surface 1
Solution
Surface 1 is used in internal ray-aiming computations, so the surface cannot be defined as a User Ray Trace surface. It should be OK to define surface 1 as a User Sag Surface as surface, but this is not normally recommended.
