Your English is far better than my Italian.
Originally Posted by giacoboh
That's the correct formula for adjusting film speed, but use the following to adjust exposure time:
corrected exposure time in seconds = (t+1)^(1/p)-1
where t is the metered exposure time in seconds and p is the Schwarzschild exponent. I should probably also state clearly that the metered exposure time in this formula is at the declared film speed 'd', not at the relative film speed from your Schwarzschild formula.
Last edited by Lee L; 04-11-2012 at 12:16 PM. Click to view previous post history.