You may use the operand RAED to measure how telecentric the system is. If you know the depth of the focus for each field, you can make use of Universal Plot, bascially plotting RAED v.s the change of thickness (the range of the depth of focus). This can be only for one field at time. KdB9Q ;
!u=,b fyH
If I understand your question correctly then this should help. L=WB'*N
koAM",5D