macro to tele lens for Panasonic GH4?

Does anybody knows if exist a M4/3 lens doing wide angle to moderate zoom and have a macro function switchable under water?
basicall the same as a videocamera does but less zoom as we don't need it under water.

I already got suggested

- Panasonic G X Vario 12-42
- Olympus 12-50

This lens would go on a Panasonic GH4 mainly used for video work.

Thanks

Chris

I have been using the olympus 12-50 for that reason. Nauticam makes a port with a dial to switch between macro and electronic zoom. Whilst its not as good as a dedicated macro, and 12 is not that wide, I been pleased with it so far.