Jorge,

Here is information for SBR and EFS you requested.

SBR Development time EFS
10 6 minutes 500
9 8 minutes 600
8 10 minutes 640
7 14 minutes 700
6 20 minutes 800


Remember, these effective film speeds are based on the high density range negative needed for palladium printing and would not serve for silver printing, except with a soft grade of AZO.

I actually did some field tests yesterday with the 12X20 J&C Classic 400. The scene was a mountain stream here in South Carolina, very late afternoon just before a thunderstorm. The lighting was very flat with a SBR of less than 6. I rated the film at EFS of 800 and basesd exposure on an average of two incident meter readings, one in the shadows and another in a fully lighted area of the scene. Exposure was 1/2 second at f/32-45. The negative was developed in Pyrocat_HD, at the 2::100 dilution for 20 minutes at 72F. Exposure was about perfect since I have some detail in the heavy shadows, and the resulting density range is about 1.8.

BTW, I just managed to get the camera and gear back in the carrying case before the rains came, but the half mile trek back to the car left me fully soaked.

Sandy