8-15 is equisolid and 7-14 equidistant projection lenses

AI says that compression at the edges is moderate for 7-14 and significant for 8-15

Would anyone have comparable samples what it would do underwater to see?

I put some examples on page 2 of this thread:

(not sure why the hyperlink box is so wonky.)

7-14 - Nice and sharp, easy to use. Great lens. I can pull some 8-15mm photos for ya if you want. Slightly less sharp (my copy) but not really notable unless corner peaking.