Quote Originally Posted by Roger Cole View Post
I think our memory of how fine grained it was is colored by comparison to the faster films of its day.
Very true. However there was also the long tonal scale that was and remains rather unique for a slow film. IMHO, no modern slow film comes even close to Pan-X in this respect.

It all comes down to modern emulsion technology. Manufacturers have gotten very good with conventional films at creating silver grains whose size remains within a very narrow range. While this makes for fine grain it also reduces the tonality range of the film. Films whose grain size has a much broader spread have better tonality. Another example that in photography you can't have everything.