You previously stated that exposing Velvia after 50 or 40 ISO is an issue, which is a 1/3 stop difference, but nailing exposure with Velvia within 1/3 stop, which of course is the same thing as 40 vs 50ISO, is not an issue as differences are rendered meaningless in film/processing variations.
Read again. My grip were the "professionals" riding high horses and stating that Fuji lies and the film is actually 40 ISO etc. Of course, none of them was basing his statements on a decent measured test against the film's data sheets and the ISO definition. Pretty much like your claims of getting 1/3 precision on 100% shots.
cheers, caveman
