Quote Originally Posted by Thomas Bertilsson View Post
I do ten minutes for EI 100. But it is up to each and everyone to test. There will be variations in lighting conditions, meter accuracy, shutter accuracy, water quality, on and on and on - variables that affect the outcome.

Do your testing.
thats the solution. Testing. Measuring between spot and integral meter often differs 1 stop in my situation. So with spot i use IE50 and with an integral meter IE100. My Time for across is 12min (with 1:1:100 pyrocat hd).