Bill Burk,

Thank you for your interest andd helpfulness!
I looked at the results closer now and made a few corrections concerning dev.time and filmspeed (see below) Why is it that at n+3 both, fp4 and hp5 go beyond their actual box speed of 125 and 400 (i printed the curves from the excel sheet on a dina4 paper and extended the curves by hand, considering they grdually went higher, until they intersected with the lines at +2 and +3)?
Bill you wrote i have to take the filmspeed results with caution...why is that...and how can i determine the correct film speeds and dev.times then...if my results should be too far off?

@tomasz: i will wait what bill suggests and see then what to do next...what about the results of your test?


FP4
N+3: iso 160 @ 23'
N+2: iso 125 @ 17'30"
N+1: iso 100 @ 11'35"
N: iso 80 @ 8'
N-1: iso 64 @ 5'30"
N-2: iso 50 @ min 4'55"
N-3: iso 40 @ min 4'30"

HP5
N+3: iso 640 @ 20'30"
N+2: iso 400 @ 16'30"
N+1: iso 320 @ 12'15"
N: iso 250 @ 8'50"
N-1: iso 200 @ 7'
N-2: iso 160 @ min 5'50"
N-3: iso 125 @ min 5'10"