Pushing hp5 in Clayton F60 developer

I need to push develop hp5 at 1600 with Clayton F60 developer. I can;t find any info on converting the time. I know that normally you adjust development for 15 seconds per degree above and below 68 but on their charts they show a dev time for hp5 at 400 of 7 minutes at 68 degrees and 6 minutes at 75 degrees, which is less of a drop in time than convention would suggest. Thus I am leery of using any of the normal conventions for push processing such as add 30 percent per stop or multiply the dev time by the square root of two. any help will be greatly appreciated.

[ Previous | Next ]