Film Speed Test

Hello!

I am currently reading Ansel Adam's, The Negative. I am trying to perform his film speed test. (Appendix A, pp 239 - 240)

The test requires that we shoot the first exposure on Zone I at the film manufacturer's ASA speed. We are to set the expsosure meter to the manufacturer's speed and then set the camera so that the exposure is on zone I. For example, I am using Ilford 400 and I set the meter to 400 and take an exposure setting that is equivalent to zone I.

Then on subsequent exposures we are to change the ISO setting in increments of 1/3. AM I SUPPOSE to change the exposure settings on the camera in order to obtain zone I for each different film speed I use. Or, I am only supposed to change the film speed and leave leave the exposure settings that gave me zone I at the manufacturer's speed.

Thanks, David

[ Previous | Next ]