I am upgrading from my sealife micro and have a Sony nex7- but the housing and etc are out of my league as I still don't fully understand manual mode shooting etc. I was looking at the compacts and decided the canons might be a good choice. however my main question is how helpful is the auto white balance button ok the g7x. do you guys really think it makes a difference and is it a deal breaker that it's not on the mark ii? any feedback would be great as long as any reviews on housings would be appreciated!