Though, a little off topic, here is the "W-speed" meter that for which I made the Excel spreadsheet to imitate its function. As you can see it is more complicated than the Contrast Index Meter, however, my solution to the problem is simpler because I use linear interpolation between the datapoints, rather than a complex function for the film curve.
My Excel calculated approximation for "E" used to calculate the W-speed = the red dot. I think it is a pretty good approximation:
Last edited by ic-racer; 08-31-2013 at 03:11 PM. Click to view previous post history.