Quote Originally Posted by polyglot View Post
Well, I got nothing visible at all on Portra 400 after 14 passes. Maybe you could measure it with a densitometer compared to a control roll but I cannot spot any difference in a side-by-side comparison.
I looked at the data again and found that my recollection wasn't too far off, but here's a little mroe that supports your experience. For 400 ASA Color Neg there was measureable but insignificant effects at 5 to 10 passes. Noticable effects were observed only at 25 passes or more. For 800 ASA noticable effects at 10 passes or more.

For most people this is well within the realm of "not a problem". I know for me it has never been, either.