Try this site. http://www.chris-iris.com/charts.shtml(posted 9004 days ago)It suggests that ID-11 gives slightly finer grain than D-76. It also gives slightly different EI and times for some films in D76 or ID-11. In the "film developement cookbook" it suggests that D76 formulated to be more consistant with different water supplies. ID11 at 1:1 has given me some really excellant negatives over the years.