Viz was poor but took out the Zeiss 24-70mm behind the Nauticam 180mm Dome. Autofocus actually worked fairly well even in low light with no focus light. The following photos have not been sharpened in any manner, just a little adjustment for exposure and color. With a minimum focus length of over a 1' not going to be a good all around lens but may be useful for fish portrait, sharks, etc. Useful for med - med/wide in tropical waters.
Shots taken at the 24mm range than 70mm for comparison. Pics taken from just over 3 feet away, max. Again not great shots but for those interested in this lens here you go.