View Single Post
  #4  
Old 14th April 2020, 10:35 AM
Mike O'Pray Mike O'Pray is offline
Friend
 
Join Date: Oct 2008
Location: Daventry, Northants
Posts: 8,968
Default

I am surprised it doesn't cover film speeds beyond ISO 100. Even in 1970 there were films beyond ISO 100. Of course although the book was published in 1970 the formula may be from an era when there were almost no films beyond ISO 100 or the person who gave the formula did not consider it to be the best for anything above ISO 100

Mike
Reply With Quote