Left a message on the Kodak site U.S. asking the difference between 5219 (Vision3 500T, http://motion.kodak.com/US/en/motion/Products/Production/Color_Negative_Films/5219.htm) and 5230 (500T, http://motion.kodak.com/AU/en/motion/Products/Production/Color_Negative_Films/5230.htm) as it was newly listed with a newer data sheet.
Received a phone call from a Kodak Australia rep (Fuji Australia last year or the year before I had to chase down numbers which most were no longer working it seemed..) explaining that 5230 is basically Vision2 (iirc) and lower cost and aimed for TV dramas etc etc. with a more limited format size and length range. He was quite helpful and enthusiastic
5219 is still the latest and greatest 500T. It comes in 100ft spools.. so it's ready to bulk load, so I dont have to buy a 400ft core and rewind by hand into a bulk loader.. which takes some damn time last time I tried.
50D comes in a 200 ft core at the smallest size.. which isn't too bad, I'd like to try that too.
And also 1000ft of 65mm.. to trim down into my saved up 120 spools and paper.