There were speed ratings as far back as the '90's...and not the 1990's either. I still use Ortho film mostly in large format. I used to use super plenechrome press and super speed ortho, super speed ortho was rated at about 125. BUT, in the lovely little papers that came with it it gave all the modifiers for filters timr of day, and time of year. 125 speed was for a bright sunny day, between 10:00am and 3:00pm, in the summertime. Shooting snow scenes early or late day could slow down to asa 10.
Originally Posted by dwross