I have the 14-140 and the proper dome for it, but in most of my underwater footage i need wide, a week ago tryed olympus 9-18 great results as i can control everything.
Never tryed the cam before hack so i can not say much about it
For WB all i do is work in kelvin and forget about doing it...
i use gh13 for underwater, with this housing http://www.diveross.com/products_eng_dettaglio.php?IDProdotto=4 , with wide angle dome, and a sammyang 8mm.
u need to adjust the focusing and de f value as its manual lens, but a im in love with this configuration.
I do things for TV and...