|The Zone system was developed by Ansel Adams and pertained mostly to B&W photography. Basically, all shades from pure white to pure black were broken down into 10 zones. Using a technique called "Previsualaztion" you would expose your film and develop the film to achieve a certian zone for a given area. I am summerizing here, I am sure you can find more details on the web
As it relates to Kodachrome, a color transparency film, I am not sure. Although, Kodachrome was really 3 layers of B&W film that had the color introduced during processing. (One of the many reasons you could not develop Kodachrome in your own darkroom)
When was the article written? I am sure the tonal range of digital sensors have gotten a lot better over the last couple of years.
I would say yes it is true that once an area is blown out in the highlights, you can not get it back. You can not retrieve data that does not exist. You can however, do a lot to make it look better or even recreate the data.
Hope this helps
Message edited by author 2006-10-18 17:09:08.