PE having a bad day? not so sure about that. he was pretty with it most posts I read of his, and personal conversations ( some on this very topic in the old "chatroom" )
.. it's a foundational number established in a lab so emulsion makers can use a specific/universal criteria to establish the film speed. he said that often.
and whether or not someone's own methodology, their shutters being accurate, their metering being accurate their developer having the same activity, their agitation being the same &c
determines a different ISO ¯\_(ツ)_/¯ .. if you or someone else get the same ISO for your working methods more power to you,
. it's funny that people make claims that try x is really iso 200 or foma is really iso 100 or tmx is really iso 32 and the
manufacturers are being overly optimistic when they say 320/400, 200, 100 just to sell film or whatever is kind of weird, seeing they are using an established methodology to determine in a lab the ISO of their film.. and it couldn't be their working methods, what or even something subjective like
what the user wants to have their negatives look like/ personal preference, or that the light was different ? it's an interesting topic that's for sure ... thankfully I expose everything at 1 second wide open so I don't have to worry about ISO.
Bookmarks