Holy cr@p, I thought the UK duty rates were complicated but it is nothing on that. I am not sure you were looking in the right place though. In note 1h at the start, under "this chapter does not cover" it includes "Cameras, digital cameras and video camera recorders (heading 8525)", which suggests they are in chapter 85 not chapter 90.
My experience is from a UK perspective, so not entirely relevant, however I have found that more often than not stuff gets through without being charged, as customs don't have the manpower to check every package so it can be a lottery.
Of course, legally, we are supposed to then toddle along to Her Majesty's Robbers & Cutthroats (I think that is what HMRC stands for) and inform them that they forgot to charge us and make a payment. I suspect that not everybody does this.
From my experience of selling stuff to the US, I think the same gamble applies as to whether you get charged.