I found a camera guy at jb hifi who seemed to know his stuff.
Take home points to add to discussion:
1. Sony 4K action cam has "optical" stability feature which is the best at removing camera shake on bumps.
2. JB are trying to get garmin which he thinks is a great product but gets few requests for it.
3. They sell 400 GoPros a month! Popular product means continued development of technology and accessories and domination may result in some other brands leaving the action cam market all together. Session 5 is very compact.


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