Sorry to ask what is probably and obvious question for many - I am using a Jobo expert drum with TMax 100 with the TMax RS developer for the first time. I found an article by J. Sexton giving development times he uses with the rotary processor which calls for a normal development of 8 minutes at 75 F when rating the film at an EI of 64. The dilution is listed as 1:9 from the concentrate. The instructions with the developer call for a time of 5 minutes for sheet film in a rotary processor (I assume when rated at 100). Am I missing something here? Why is there such a big discrepancy? Is it that what he is calling a 1:9 dilution a further diluting-down of Kodak's working solution? Thanks for the help.