Lens choice

Hi !

I am using a GH4 with a oly 9-18 for both photos and video but would like to upgrade whit a better/wider lens, and would like to have your advice regarding which lens to choose for wideangle. mostly wrecks in green , quite dark waters. (baltic sea) I am intrested to have the best possible picture quality whith the camera for both photos and video. I am thinking of panasonic 7-14 or tha nauticam WWL-1 wetlens whith a pan 14-42. what would you recommend ? Or do you recommend to have to different lenses , one for video and one for photos.

Please come whith some advise, pros and cons

Those questions have been debated here extensively. The search function is your friend. Two recent examples:

http://wetpixel.com/forums/index.php?showtopic=58458

http://wetpixel.com/forums/index.php?showtopic=58437