I could be wrong on all of what I said above, just my understanding. I'm sure Panamorphs website would help to understand.
A Vertical squeeze design would seem to work better for constant width setups (where both 16:9 and 2.35:1 are the same width), where as horizontal stretch would seem to be ideal for constant height setups where you want the 2.35:1 image wider than 16:9.
To me an anamorphic lens is only worth it if you go constant height. The whole point of an anamorphic lens is to recreate the cinema feel by making 2.35 movies wider than the rest.
If your limited on the width of how big your screen can be, then a vertical design might be an option?
