Quote Originally Posted by ic-racer View Post
Shoot any uniform surface without texture illuminated by light you normally use (ie tungsten vs daylight). Focus lens at infinity. Shoot zone I. Place processed negative over light meter, the frame that drops exposure by 1/3 stop = 0.1 log d = good exposure index.
OK I set up and did this test yesterday but the results were inconclusive. Just to be sure I have this straight, I am testing for a film speed bu making 8 exposures between ASA 40 and 160. So I am to meter on my big piece of cardboard for each film speed and close down by 4 stops? Thank you.