I am about to start a project with fairly long exposures (several minutes or more) using most fp4+ & hp5+. The chart that Ilford provides is only good out to 35 seconds and the little infomation I found was beyond that Ec=Em^1.48 was the "correct" formula to use. Does this seem right?
Up until now, I have always used Acros for long exposures, but I want to dry a different look.
Any insight would be greatly appreciated.