Where might one find diagrammatic formulae for lenses?
I have a Sigma Zoom K f4.5, 100-200mm, M42 mount, that has a few elements out of place. The lens is otherwise fully intact and the glass is perfect, but someone messed up the alignment. Everything is there but I need to know the order and direction of some of the elements. Some of those elements are easy to figure out because they can fit only one way, but there are several that can be placed in multiple ways. If I see an accurate diagram of the elements, lined up in profile, I can do this successfully.
In general, and, hopefully, specifically for this Sigma, where does one go to find these diagrams? I have tried Google to no avail. I have contacted Sigma and am waiting but not holding my breath. - David Lyga