It's been a while,
Originally Posted by Lee L
could you please write the formula you were referring to?
I found this but my result doesn't match your:
Relative film speed = d*(t+1)^(p-1)
[p=Schwarzschild exponent; t=exposure time; declared film speed]
I'm trying to estimate correct exposure for my pinhole camera (f/315) which use FP-100 with a metered time of about 4 minutes.
(Sorry for my bad english)
Last edited by giacoboh; 04-10-2012 at 06:28 PM. Click to view previous post history.