Since you know the number, I assume that you know official government inflation excludes certain categories like food. I believe that you can feel the inflation is much more than 2% from grocery stores, restaurants, and many many places. That's why stock goes to history high and richer became much more richer.
In March 2004, the Dow Jones industrial average was about 10300, and today is 16340. If you put 7000 in the stock market your stock will be worth 11000 without dividends in average in the past 10 years.
The CPI does include food. Its the first item listed.
Inflation and the Dow Jones are two different animals and aren't comparable. No argument from me about the rich getting (much, much) richer, that's a plain fact, but it has nothing to do with inflation. Back to lenses though, as someone pointed out earlier some of the super tele's got a big boost in resale value after the vII's were released with huge new price tags. Pro level camera gear is pretty unique in how well it holds its value. And really, even if you lose a little to inflation, it isn't much in the grand scheme of things when you consider how much this hobby/profession costs.
CPI is not Core inflation. Core inflation excludes food and energy.
Some of supertel lens was sold higher price than original price. However, that's wrong comparison between present value and future value. Moreover, that's a logical fallacies, hasty generalization, to explain big white lenses holding their value.