Will it work?

On a Nauticam NA-D300s will the Nikon 12-24 or Tokina 11-16 work with just the dome port? Going by back scatters port finder I would need a extension ring.

Thanks

While those lenses may fit inside the dome and work without and extension ring the results will be less than satisfactory (distortion, soft edges etc) because the entrance pupil of the lens will not be aligned with the centre of the dome. There's more information here:

http://wetpixel.com/i.php/full/dome-theory/