I working with 4X5 TMax 100 now and noticed in the Kodak Publication F4016 the reference to KODAK WRATTEN Filter factoring and exposure. I have B+W filters.
How do the Wratten Factors compare to the B+W X factor? I cannot find any reference to Wratten at the Schneider site.
My B+W Red filter is B+W #90. It has an exposure factor (X) of 5 which means to open the shutter 2,5 stops. As I understand it.
The Wratten No. 25 (red) simply says open 3 stops.
For TMax 100 opening the lens for the B+W #90 3 stops is not the answer... I can prove it.
Thanks for for your thoughts,