camera table for all my lasers?

[Draz]

Draz here, need some help understanding camera for lasers, here is what I would like to do,
a 20" x 20" work table bed with a adjustable height arm mounted camera, centered above the work bed,
work bed will have squares equal to each galvo lens, 70mm sq, 110mm sq, 150mm sq, so on an so on.
the camera will be focused by raising an lowering to the focus of each lens, can this be done, will it work?
or can I keep the camera at max height for all lens? I hope I will get some comments, thank you , Draz