Quote Originally Posted by timparkin View Post
resolution got better until 10 micron and then the grain/noise started hiding detail.
Interesting that 10 micron value... this is just 50lp/mm spatial frequence, and this also is the top resolving capability of sharp films like TMX in low contrast conditions, so it arises the question that it could be due to aliasing with grain size of the Tabular layer for BW. (Also there is the low speed cubic layer under that resolves much more, 200, I think).

It would be interesting to know if optimal aperture for CMS 20 it is the same or if 3um is better for it.

Another interesting question it would be knowing best aperture for color negative films that have larger color clouds (reengineering made to perform well in those digital minilabs of the Frontier era) compared to Velvia/Provia.

Just speculating if a matching grain/cloud size vs aperture can worsen things...