> ISO/ANSI standard uses 0.1 over b+f (when developed to a CI around 0.6) as the speed point.(posted 8158 days ago)See what's different? We usually don't develop to such a high CI and when we develop to a lower CI the .10DU speed drops a little.
This parallels the usual gripe about Agfa Rodinal; when film's developed according to Agfa's recommendations the negs are bulletproof and the reason is that Agfa's recommendations result in a CI of .65. So when the negs are developed to a CI of .50 in Rodinal the EI's quite a bit lower.