Water clarity has a lot to do with what you can see. As someone who has been scuba diving in stained to dirty water, as well as someone who has used the water cam's while ice fishing in MinnICEsota, I can tell ya that there is not any given lens that will clear up the murkiness in the water. Unless you've got an ultraviolet camera or a camera that can pick up the infrared signals... then you may have a chance... but then you're also looking at way too much money to consider.