The traditional ways to compute the displacements of zoom lens movable components are generalized and subjected to criticism. The new simple, easy realized, universal method is considered. This method is applied to designing various complicated zoom optical systems.
Andrey V. Ivanov,
"Automatic computation of displacements of zoom lens movable components", Proc. SPIE 3780, Optical Design and Analysis Software, (27 September 1999); doi: 10.1117/12.363776; https://doi.org/10.1117/12.363776