The tec rep at Ilford says that D76 is the same basic formula as ID11. Efke shows a development time of 6 minutes with ID11 full strength, I've used that with D76 and had good results. Don't know about 1:1, you'll need to do a little extrapolating there. Pretty good film by the way, am using to keep my Yashica 44 running.(posted 9299 days ago)