The familiar EOS-1D C isn't the only Canon camera to make its public debut ahead of NAB. The Cinema EOS series welcomes a third model to the collection this week, with looks that nearly match last year's C300. Unlike that model, which you can already pick up through e-tailers and at specialty shops, the C500 has a long way to go before it gets a shipping nod -- it may not even make it to market in 2012. The $30,000 price tag may pose an even greater barrier to entry than its to-be-announced availability date, however, and may in need of some tweakin