Hi there folks,
I wrote up some details for how to "fix" your focus on a lens behind a dome port. I went into this not knowing how this works, and thus tried to document what I learned in order to give back to the community.
I welcome any comments, questions, flames, etc.
My core motivation was to increase my ability to focus up close, while also being able to take advantage of the full range of focal positions of my lens under water. I am mostly excited that I think I will be able to focus closer without loosing hyperfocus performance using a +2 diopter. Yay, science.