zone system push pull

guys i ben reading a lot about zone system now i want to practice it. the problem is i am using 35mm slr . u know rest of the story. this months pp magazines shows that ilford fp4 plus has a great latitude of -1 2/3 / +1 2/3 witch i think makes it the best roll film for pull and push process hence achief the zone required. quistion is, is what i am thinking is correct if so then can anybody tell me what is the actuall film speed for ilford fp4 plus and what is the time increasment or decreasment for n-1 n-2 n+1 N+2 when developed in ilford ID-11 this is the only developer we have in bahrain what a petty.!! thanx

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