Juan Valdenebro
Member
Many people disagree with that... All those of us who find HP5+ reaches 400 with normal contrast in ID-11 but TMY doesn't... Anyway, I'm fine with you thinking your way... Thank you!No, because you are saying that it is slower than other ISO 400 films.
And it isn't - it is a full ISO 400 film.
If you change the measuring criteria to one that builds in a 2/3 stop change, like Zone System criteria, it is a full EI 250 film.
Other 400 ISO films might be designed to rate higher using Zone System criteria, but that won't help you in most circumstances with roll film shot in varying circumstances, where ISO metering is most beneficial.