Hello All,

This may seem retarded and all, but I'd love to know the answer in a plain way. For example, with Ilford Delta 100 and PanF the way to find out your adjusted shutter speed for measured times greater than 1/2 second is to do this algorithm:

Y=1.465^X+1 (Measured Time + 1 to the power of 1.465 = Adjusted time - where 120 seconds adjusted is 18.76 minutes)

Does anyone know this way of figuring out the adjusted time for Velvia 50 and/or 100? The only thing I can get off of the Fuji website is to use a magenta filter and to add 1/3 of a stop to 2/3 of a stop. But that should be just to offset the filter it recommends.

Thank you!

-Brian